Carbon Ocelot's Final Fantasy X Walkthrough

Index

Plot
Intro
Submerged Ruins
Besaid
Kilika
Luca
High Road
Mushroom Rock
Djose Temple
Moonflow
Thunder Plains
Macalania Woods
Lake Macalania
Bickanel Island
Bevelle
Calm Lands
Mt. Gagazet
Zanarkand
Highbridge/Temples
Sin

Single Page Version

Arena

Arena Intro
When you first get to the calm lands, head to the Arena structure, located to the very far east of the little hut in the middle. Talk to the man there to begin your fiends capturing days. He'll tell you he needs you to capture at least one of every fiend in the calm lands. Buy some weapons that have the "capture" attribute (well, for Tidus, Wakka, Auron, and Kimari anyway), and go kill 'em off. See the "Calm Land" section below to see what fiends you'll need to acquire. When you kill off all the fiends in the Calm Lands, you'll see a chest appear. If you've charged the cloudy mirror (see misc side quests section), you'll be able to open this for Yuna's ultimate weapon: Nirvana.

Once you have captured the fiends in the Calm Lands, he'll open for business. Now you can capture up to 10 fiends from every habitat in the game (there are 12 habitats). I've listed the habitats below, in the order they appeared to you in the game. When you first arrive in the Calm Lands, you will not be able to access many of the ares; don't worry - we'll get there soon. I recommend going all the way back to the Thunder Plains as soon as the arena is opened to you, and getting 10 of every monster in each of the habitats you have access to.

You can use my ffx fiend tracker to ensure you've captured all the fiends.

As you capture 1 of each enemy, then 10 of each enemy, the guy at the arena will give you cool prizes and create new - really hard - enemies for you to beat. Don't worry if you cannot beat them as they appear; this is where the hardest enemies in the game can be found. Just keep going through the game until you get to Sin - that's when you should start trying to beat these guys. As you defeat them, you'll recieve spheres that let you level your characters up to rediculous levels. For example, when I went to fight the final boss, all three of my front-line characters had all their attributes at 255, except for "Luck." It was maybe a couple of hits and he was gone.

Besaid
You'll be able to come here as soon as you get the airship. Just head there, and wander toward Waterfall Way. All (three) enemies can be found here. When he's made a nasty beast, you'll get 99 Stamina Tonic. You can also now fight Stratoavis. He'll also have created a new monster.

Available Enemies: Dingo, Water Flan, Condor.

Kilika
All enemies are found in the forest area - the only area you see, really. For Nasty Beast, you get Poison Fang x99. It's a Malboro Menace.

Available Enemies: Yellow Element, Killer Bee, Dinonix, Ragora.

Mushroom Rock
You should have 10 races and areas when you are done with this section. You should get the Mars Sigil here. Also, from getting everything from Mushroom Rock Road, you'll get Candle of Life x99. He'll create Coeurlregina (Steal Farplane Wind). He'll also be able to create a new Imp monster at this time. If you are having trouble finding enemies, check out the Misc Quests section; there's a hidden area around here.

Available Enemies: Red Element, Fungar, Raptor, Lamashtu, Gandarewa, Garuda.

Sanubia Desert - Bickanel
When you capture 10 of all enemies here, the Arena guy will give you Shadow Gem x99 and you can fight the Abyss Worm.

Available Enemies: Mushussu, Sand Wolf, Alcyone, Zu, Sand Worm, Cactuar.

Mi'ihin Highroad
Don't forget a few things about this area. The are many areas here: South End, South Road, Central Road, New Road, and Oldroad. Some enemies are only found on a few screens. When you capture them all, Kottos will be unlocked in the arena, and you'll get Soul Spring x99.

Available Enemies: Floating Eye, Bomb, Vouivre, thunder Flan, Mi'ihen Fang, Dual Horn, White Element, Ipiria, and Raldo.

Djose Highroad
When you've collected all these enemies, he'll create Jormungand and give you Petrify Grenade x99.

Available Enemies: Lamashtu, Raptor, Fungar, Gandarewa, Garm, Bunyip, Bite Bug, Basilisk, Snow Flan, Simurgh.

Moonflow
Don't forget there are TWO sides to this - North Bank Road and South Bank Road.

Available Enemies: Gandarewa, Fungar, Garm, Bunyip, Bite Bug, Snow Flan, Ochu.

Thunder Plains
You can find most of the beasts in most areas around here. When you have all the enemies from here, you'll get 99x Chocobo Wing and he'll have the Cactuar King enemy available.

Available Enemies: Melusine, Aerouge, Buer, Gold Element, Kusariqqu, Larva, Iron Giant, Qactaur.

Macalania
Macalania is made up of two large areas, and many small areas. Be sure to look through BOTH Macalania Woods AND the Macalania Temple area. From finding all monsters here, he'll give you 60x Shining Gem and can fight Espada.

Available Enemies: Snow Wolf, Iguion, Wasp, Evil Eye, Ice Flan, Blue Element, Murussu, Mafdet, Xiphos, Chimera

Calm Lands
You'll have to search pretty much the four corners to get one of each of these. You want to find the following near the entrance: Skoll, Nebrios, Shred, Flame Flan. You can find an Anacondaur, ogre, or a Malboro (Use Valefore to weaken it; sonic wings are your friend!) in the north west area. The Ogre can also be found just north and slightly west from the hut/store in the middle. A Coeurl can be found in the northern area. Find a Chimera Brain in the southern area (by the chests in the shadow area).

For bringing in one of every beast, he'll create "one nasty beast" and give you Farplane Wind x60. Save your game, and fight Chimerageist.

Available Enemies: Skill, Nebiros, Flame Flan, Shred, Anacondaur, Ogre, Coeurl, Chimera Brain, Malboro.

Temple of the Stolen Fayth
I didn't notice anything obvious about where these guys were located. Note, however, that Ghosts are vulnerable to Delay attacks and one or more random magic (use sensor to see which). Just make your way in between the save points until you have everything you need. You may have trouble finding one or more of them, though. I took a while before I stumbled across a Tonberry (triple foul works well on him), for example. If you run across a Magic Pot, just run; that's my advice.

Anyway, once you do manage to get at least one of all of them, he should make an Don Tonberry, and you'll get Silver Hourglass x40.

Available Enemies: Deffender (cannot be captured), Coeurl, Malboro, Nidhogg, Dark Element, Epaaj, Thorn, Ghost, Yowie, Valaha, Imp, Tonberry (Green Room, 2nd chamber).

Mount Gagazette
You can fight all the same creatures inside the mountian as you can fight outside - and then some. Well, except for Grenades. Once you have captured a bunch of grenades, you can wait until you've finished this area. Which is to say, don't bother trying to capture everything OUTSIDE before going inside. When you get some of each, he'll make you a Catoblepas and give you the Blossom Crown.

Available Enemies: Nidhogg, Imp, Grat, Grenade, Bandersnatch, Bashura, Behemoth, Mandoragora, Dark Flan, Grendel, Ahriman, Maelspike (underwater), Achelous (underwater), Splasher (underwater).

Omega Ruins
Bring one of each of these, and you'll get Designer Wallet x60 and a Vorban.
Available Enemies:
Defender Z: (Use Armor Break! Weaken them, then use Bahamut's Impulse for Overkill.)
Treasure: (Use Mug to get something but not let out a monster).
Zaurus: (easy)
Machea: (Will poison you with each attack.)
Floating Death: (Be sure to steal Musk from this guy; you can make confuse proof)
Halma: (Use Armor Break!)
Demonolith: (Use Armor Break; Counters with "Pharo's Curse" for Curese, Poison, Darkness, Silence)
Spirit: (Sometimes counters with confuse/poison mist)
Puroboros: (Better do a LOT of damage so they don't explode; armor break and 2x tripple foul)
Black Element: (Armor break. When you've got a complete set, be sure to use armor break before calling Bahamut for Impulse Overkill.)
Master Coeurl: (Easy)
Great Malboro: (Seriously, "bad breath" sucks. Bring in Valefor and use Sonic Wings.)
Varuna: (Beware Death)
Adamantoise: (Use Armor Break!)
Master Tonberry:(Bahamut is your friend if doing an overkill. Otherwise, he'll use "Voodoo" to kill off your Aeons.)
Wraith: (Your aeons are immune to doom and death; have them weaken this guy.)

Sin

Finish off the enemies here to get access to all but one monster in the arena (you have to beat everything in the arena to get access to the last one).

Available Enemies:
Ahriman: (Sea of Sorrow, City of Dying Dreams)
Adamantoise: (Sea of Sorrow, City of Dying Dreams)
Gemini: (Sea of Sorrow, City of Dying Dreams)
Exoray: (Sea of Sorrow, City of Dying Dreams)
Demonolith: (City of Dying Dreams)
Great Malboro: (City of Dying Dreams)
Wraith: (City of Dying Dreams)
Bahemoth King: (Sea of Sorrow, City of Dying Dreams) (Steal Twin Stars!)
Barbatos: (City of Dying Dreams)

Arena - Area Conquest, Species Conquest, and Originals
As you bring the guy fiends from the various lands, you'll begin to unlock fiends that only exist here. This is really where the heart of leveling up takes place. :D See the section below for the different categories of special fiends, as well as strategies specific to the fiend. Just FYI: When you are killed in battle (notice I didn't say if) he'll clean your guys up - no need to reset the game. ;) You'll lose your overdrives though, if you've used them. That goes for Aeons, too.

After you have defeated a certain number (I can't remember how many), he will begin selling the Clear Sphere item. These allow you to clear out used entries on the sphere grid; this is how you can REALLY max out your guys. You can clear a Strength +1 sphere and the use a Strength Sphere top turn it into a Strength +4 node. However, be aware that any character who activated the original node will lose that enhancement and will need to reactivate. Don't forget you can use a Return Sphere to revisit any node that character has previously activated.

You can't clear out ability nodes, which is a little disapointing. (I'd like to get rid of the lowest level black magic, for example.) By around 90 hours in, I can have all seven characters maxed at out 255 for all skills (even Luck!) A few other pointers. While it would be nice if Aeon HP went up based on Yuna's, that's only true until she hits 9999 HP. Even if you add Break HP limit to her armor, it won't increase their stats.

Area Conquest
When you have conquered all the enemies of a certain AREA, you will allow him to create a new enemy.

Enemy	Unlock for	Steal	Win
Stratoavis	Stamina Tonic x99	Smoke Bomb	Amulet x2
Malboro Menace	Poison Fang x99	Remedy	Mana Tonic x2
Kottos	Soul Spring x99	Soul Spring	Healing Spring x20
Coeurlregina	Candle of Life x99	Blessed Gem, Farplane Wind	Shining Gem x3
Jormungand	Petrify Grenade x99	Petrify Grenade, Three Stars	Supreme Gem x2
Cactaur King	???	Chocobo Wing	Blessed Gem x3
Espada	Shining Gem x60	Farplane Wind, Farplane Shadow	Rename Card
Abyss Worm	Shadow Gem x99	Shadow Gem	Stamina Tonic
Chimerageist	Farplane Wind x60	Mana Spring	Return Sphere
Don Tonberry	Silver Hourglass x40	Candle of Life	Farplane Wind x3
Catoblepas	Blossom Crown	Healing Spring	Three Stars
Abaddon	Lunar Curtain x99	Purifying Salt	Mana Tablet
Vorban	Designer Wallet x60	Healing Spring	Friend Sphere

Species Conquest
When you collect one of each TYPE of enemy, you'll enable him to start creating Species Conquest enemies. You'll get neat prizes for these, too. :D

Enemy	Unlock for	Steal	Win
Fenrir	Chocobo Feather x99	Chocobo Feather	Agility Sphere
Ornitholestes	Stamina Spring x99	Rename Card	Gambler's Spirit
Pteryx	Mega Phoenix x99	Smoke Bomb	Evasion Sphere
Hornet	Mana Tonic x60	Poison Fang	Accuracy Sphere
Vidatu	Mana Spring x99	Lightning Gem, Mana Tonic	MP Sphere
One-Eye	Stamina Tablet x60	Blessed Gem, Lunar Curtain	Magic Def Sphere
Jumbo Flan	Twin Stars x60	Mana Tablet, Lunar Curtain	Magic Sphere
Nega Elemental	Star Curtain x99	Star Curtain	Twin Stars x2
Tanket	Gold Hourglass x99	Light Curtain, Lunar Curtain	Defense Sphere
Fafnir	Purifying Salt x99	Stamina Spring, Gold Hourglass	Light Curtain x20
Sleep Sprout	Healing Spring	Poison Fang, Farplane Wind	Teleport Sphere
Bomb King	Turbo Ether x60	Fire Gem	Door to Tomorrow
Juggernaut	Light Curtain x99	Shinning Gem, Lunar Curtain	Strength Sphere
Ironclad	Mana Tablet x60	Light Curtain	HP Sphere

Originals
Every so often, he'll come up with something original. To celebrate, he gives you something.

Greater Sphere: Supreme Gem x60 Steal: Gambler's Spirit

Enemy	Unlock For	Steal	Win
Earth Eater	60x Three Stars	Gambler's Spirit; Lv. 1 Key Sphere	Fortune Sphere
Greater Sphere	Supreme Gem x60	Gambler's Spirit	Luck Sphere
Catastrophe	Door to Tomorrow x99	Gambler's Spirit	Designer Wallet
Th'uban	Gambler's Spirit x99	Gambler's Spirit	Underdog's Secret
Neslug	Winning Formula x99	Gambler's Spirit	Pendulum
Ultima Buster	Dark Matter x99	Gambler's Spirit
Shinryu	Megalixir x30	Gambler's Spirit
Nemesis	Master Sphere x10	Gambler's Spirit	Lv 4. Key Sphere!!!

Strategies for Fighting Arena Enemies

Area Conquest

Stratoavis:
Num Max Hits: 4
Steal: Smoke Bomb (GF learn Dark Attack, add Darkstrike to weapon, add Darkproof to armor); Stamina Spring (GF learns Power Break, add Str +5% to weapons, add Def +5% to armor)
Loot: Amulet x2/x4 (add Pickpocket to armor), Magic Up Weapons, HP Up Armor
Regular strategy applies. For parties without Break Damage weapons, use a powerful Aeon. Otherwise, Mug/Quick Hit 4 times.

Malboro Menace:
Num Max Hits: 7
Steal: Remedy (Add Auto-Med to armor); Mana Spring ( Aeon learns Osmose and Magic Break, add magic +5% to weapons, add magic def +5% to armor)
Loot: Mana Tonic x2/x4 ( Add MP + 30% to armor); Status Effect Weapons; Status Effect Armor
Start with Yuna NOT in the party and make sure someone has First Strike on their weapon. This enemy can ambush you with a nasty Putrid Breath attack that causes a variety of status to which Aeons are immune. Swap in Yuna and have her call in a powerful one to take the initial attack; have the Aeon haste. If you have a weak party, have the Aeon do the work. If you have a powerful party, you can dismiss the Aeon and have them take him out.

Kottos: Num Max Hits: 5
Steal: Stamina Spring ( Aeon learns Power Break, add Str +5% to weapons, add Def +5% to armor ), Soul Spring ( Aeon learns Lancet, add HP +10% to armor, add MP +10% to armor )
Loot: Healing Spring x20/40 ( Aeon learns Regen magic, add SOS Regen and Auto-Regen to armor Counterattack/Magic Counter weapons, HP Up Armor
This enemy will counter attack. Should use a powerful Aeon with Haste and Shield. More powrful parties can get by with either auto-phoenix armor or a high defense.

Coeurlregina:
Num Max Hits: 4
Steal: Farplane Wind ( Add Deathstrike to weapon, ), Blessed Gem ( Aeon learns Holy white magic, add Defense +20% and Magic Def +20 to armor)
Loot: Shining Gem x3 ( Aeon learns Flare, add Magic Counter to a weapon, add Deathproof to armor), Deathstrike weapons, Double AP armor
This enemy's attack can cause confuse. If it ambushes you, it can be trouble. Weak parties should start without Yuna in the party and have her call a powerful Aeon to take the hit, then haste.

Jormungand:
Num Max Hits: 6
Steal: Petrify Grenade ( Add Stonetouch/Stonestrike to a weapon, add Stoneproof to armor), Three Stars ( Aeon learns Doublecast, add One MP Cost to weapons, add Break MP Limit to armor)
Loot: Supreme Gem x2/x4 ( Aeon learns Ultima, add Magic +20% and Strength +20% to weapons),
This enemy has a couple of really nasty attacks. Cold Stare will turn a character to stone, then remove them from battle - you'll have only two charactres for the duration of the fight. The strategy is similar to the other battles here. Weak parties should use a powerful Aeon with Haste and protect.

Cactaur King:
Num Max Hits: 2
Steal: Chocobo Wing ( Aeon learns Hastega (buy why bother when Haste is sufficient?), add Auto-Haste to armor), Designer Wallet (Add Gillionaire to weapons)
Loot: Blessed Gem x3/x6 ( Aeon learns Holy white magic, add Defense +20% and Magic Def +20% to armor)
This enemy's special attack will do 99,999 damage to a character or Aeon. Recommended for strong parties (or you can throw away Aeons). His Evade skill is off the charts, making it hard to land attacks. He will counter attack with a massive blow - two characters with auto-phoenix are helpful.)

Espada:
Num Max Hits: 3
Steal: Farplane Shadow ( Aeon learns Death magic, add Deathtouch to weapons add Death Ward to armor) Farplane Wind ( Add Deathstrike to weapons, add Deathproof to armor)
Loot: Rename Card x1/x2 (Use to rename an Aeon), Strength+ weapons, Defense+ armor
This enemy has a massive counter attack. It's recommended to wait until your party has high evasion before trying this fight. Weaker parties should use a powerful Aeon.

Abyss Worm:
Num Max Hits: 5
Steal: Shadow Gem (Aeon learns Demi), Stamina Tablet ( Use in battle to double Max HP of one character, add Auto-Potion and HP Stroll to armor)
Loot: Stamina Tonic x1/x2 ( Use in battle to double the max HP of the whole party!, Add HP +30% to armor), Strength+ Weapons, Defense+ Armor
For this enemy, be mindful of his "Swallow" attack (like the Sand Worm, you lose your guy until he "Regurgetates" him back up; unlike the Sand Worm, it basically kills your guy!). He will use this attack when you've done around 40K of damage. Again, weaker parties should use a strong Aeon. Stronger parties should assume one character will not get AP for the battle.

Chimerageist:
Num Max Hits: 2
Steal: Mana Spring ( Aeon learns Magic Break and Osmose, add magic +5% to weapons, add magic Def +5% to armor), Stamina Spring ( Aeon learns Power Break and Drain, add Str +5% to weapons, add Def +5% to armor)
Loot: Return Sphere x1/x2 (Return to any previously activated node), Elemental attack weapons, Elemental defense armor
Strong parties should have no trouble with this enemy. If you can't do max damage with a character or Aeon, you may want to wait on this one. On the other hand, most of his attacks follow a regular pattern and are magic based. Weak parties should use null magic and have Auron use Sentinel with Protect magic for the physical attacks.

Don Tonberry:
Num Max Hits: 6
Steal: Candle of Life ( Add Zombiestrike to weapons, add Zombieproof to armor), Designer Wallet (Add Gillionaire to weapons)
Loot: Farplane Wind x3/x6 ( Add Deathstrike to weapons, add Deathproof to armor), status attack weapons, status proof armor
At first glance this is a really dangerous battle. He will counter every attack with Karma (basically auto-death to everyone) and will expell your Aeons with Voodoo. On his turn he will approach the party. After four times he will randomly kill someone. You can also grind AP really effectively with this enemy. If you customize your weapons with Triple Overdrive, Triple AP, and Overdrive -> AP, that character can earn a massive amount of AP each battle. Set one character's Overdrive mode to Stoic and the others to Comrade, and then add auto-phoenix to your armor, it's a quick way to get AP. Just have the one with stoic be the only one that attacks and have the others haste that one so they can attack over and over.

Catoblepas:
Num Max Hits: 6
Steal: Healing Spring ( Aeon learns Regen, add SOS Regen and Auto-Regen to armor), Stamina Tonic ( Add HP +30% to armor)
Loot: Three Stars ( Aeon learns Doublecast, add One MP Cost to weapons, add Break MP Limit to armor), status attack weapons, status defense armor
This enemy's gimik is that he can kill the whole party with a powerful post-death ultima attack. If you have high Magic Def, it won't be a problem. Otherwise, find ways to apply auto-life to your characters of have the finishing blow be delivered by a counter attack (which won't trigger the counter attack.) Weak parties can have a powerful aeon deliver the finishing blow and thus avoid the party being killed.

Abaddon:
Num Max Hits: 4
Steal: Purifying Salt ( Aeon learns Dispel, Add No Encounters to armor), Shining Gem (Add Magic Counter to Weapon)
Loot: Mana Tablet 1x/2x (Add MP Stroll to armor), Magic+ weapons, Magic Defense+ armor
This enemy can apply Dark, Poison, and Curse to your team. Use armor to avoid it, or apply Auto-Med to armor, or items/magic to counter it. He uses a lot of elemental magic, so Null magic can be useful, though you'll need to apply it without knowing which ones are important.

Vorban: Num Max Hits: 7
Steal: Healing Spring ( Aeon learns Regen, Add SOS Regen and Auto-Regen to armor), Stamina Tablet ( Add Auto-Potion and HP Stroll to armor)
Loot: Friend Sphere x1/x2 ( Teleport to any ally's location on the board, Add Counterattack to weapons), Str+ weapons, Def+ armor
He counters with a Mortar attack that damages all party members. If your Defense is high enough, a powerful party can win this battle reasonably quickly. Weaker parties should use the usual strategy: Call a powerful Aeon, use Haste/Protect, attack and heal like normal.

Species Conquest

Fenrir:
Num Max Hits: 9
Steal: Chocobo Feather ( Aeon learns haste, add Initiative to weapons, add SOS Haste to armor), Chocobo Wing ( Aeon learns hastega (but why bother?), Add Auto-Haste to armor)
Loot: Agility Sphere 1x/2x (Turns an empty node into an Agility node), status effect weapons, status effect armor
Powerful parties can get away with Haste and quick hit. You might be able to take him out before he gets a shot in. If not, have armor that protects against Confuse. Weaker parties should Call in Aeons and have them attack. If you've leveled up your compatibility with Yojimbo, this is a good place to use him. He's able to dodge the insta-kill attacks with some regularity, and paying him 200 Gil appears to be sufficient to keep from lowering compatibiliy throughout the battle. His Fangs of Chaos attack will still connect, but it does a percentage of damage rounded down. That means that attack will never kill a character or Aeon.

Ornitholestes:
Num Max Hits: 9
Steal: Rename Card (Use to rename an Aeon), Chocobo Wing ( Aeon learns Hastega (but why bother?), add Auto-Haste to armor)
Loot: Gambler's Spirit 2x/4x ( Adds SOS Overdrive to weapons), Double Overdrive weapons, Def+ armor)
Powerful parties can get away with Quick Hit. Weak parties should call a powerful aeon. His Poison Touch attack will nearly kill any Aeon (and any character). If you are lucky, he'll use Drain Touch, which isn't nearly as powerful. Call a powerful Aeon and use Haste, Protect, Reflex. If he dodges all your attacks, you may have to resort to filling your overdrive guage and using Overdrive attacks. If you do that, make sure he doesn't get three or more attacks after you. Spend your time healing and shielding instead.

Pteryx:
Num Max Hits: 2
Steal: Smoke Bomb ( Aeon learns Dark Attack, add Darkstrike to weapons, add Darkproof to armor), Candle of Life ( Add Zombiestrike to weapons, add Zombieproof to armor)
Loot: Evasion Sphere x1/x2, Str+ weapons, Def+ armor
This enemy can ambush you with Beak of Woe, which causes curse. If you need your overdrives to beat him, you'd better have some Holy Water items handy. This should be a quick battle for strong parties. Weak parties should follow the normal strategy of calling a powerful Aeon and going for a quick kill. Hopefully you don't need your Aeon's Overdrive if he uses Beak of Woe.

Hornet: Num Max Hits: 7
Steal: Poison Fang ( Aeon learns Bio, add Poisonstrike to weapons, add Poisonproof to armor), Purifying Salt ( Aeon learns Dispel, add No Encounters to armor)
Loot: Accuracy Sphere x1/x2, Str+ weapons, Def+ armor
For strong parties, use Haste and Quick Hit. If you can do 7 attacks of 99,999 you'll kill him off before he gets an attack. For weaker parties, follow the usual strategy of using a strong Aeon with Haste and Protect.

Vidatu: Num Max Hits: 1
Steal: Lightning Gem (Add Lightning Eater to armor), Mana Tonic (Add MP +30% to armor)
Loot: MP Sphere (Turn any empty node into MP +40), Double AP weapons, MP+ armor
Strong parties can take this guy out in one hit. This makes this an excellent spot to farm Dark Matter. If you're having trouble with his armor, use a Frag Grenade to inflict Armor Break. (Just using Armor Break will only work about 1 in 5 tries.) He's immune to elemental magic, but you can use things like Flair or Holy. If you can't hit him consistently, try using Special ability Aim four or five times to raise your accuracy. The down side to farming Dark Matter here is that this enemy only drops MP Spheres, which you almost certainly won't need by the time you're able to begin farming.

One-Eye: Num Max Hits: 2
Steal: Lunar Curtain ( Aeon learns Shell, add SOS Shell and Auto-Shell to armor), Blessed Gem ( Aeon learns Holy white magic, add Defense +20% and Magic Def +20% to armor)
Loot: Magic Def Sphere x1/x2, Tripple AP weapons!, MP+ armor
This is one of those enemies that you probably won't want to tackle until you've gotten your Agility and Accuracy high enough, preferrably with Break Damage Limit weapons. Otherwise, try the usual strong Aeon stratgy. The Vidatu strategy can also help.

Jumbo Flan: Num Max Hits: 14
Steal: Lunar Curtain ( Aeon learns Shell, add SOS Shell and Auto-Shell to armor), Mana Tablet (Add MP Stroll to armor)
Loot: Magic Sphere (Turn an empty node into a Magic node), Magic Booster weapons, elemental defense armor
This guy is REALLY tough. Stronger parties should begin by reflect-casting slow on him. (Don't cast directly at him - he has Auto-Reflect). If he casts reflect on a character, be SURE to dispel it! You don't want him casting regen back on himself!!! Then reflect doublecast flare and have the rest of the party Copycat that. If Yuna has her ultimate weapon, the One MP Cost attribute makes this much less taxing on the MP. Weaker parties should leave this fight to Anima: cast haste and shell, then use pain when you can, shield when it's his turn, dispel reflect or heal with Curaga as needed. Hopefully by the time you're trying this fight you don't actually need to have Anima shield.

Nega Elemental:
Num Max Hits: 14
Steal: Star Curtain ( Aeon learns Reflect black magic, add SOS Reflect and Auto-Reflect to armor), Twin Stars (Add Half MP Cost to weapons)
Loot: Twin Stars 2x/4x (Add Half MP Cost to weapons), elemental attack weapons, elemental defense armor
This enemy counters all attacks with Ultima at a bruital power level. The only solution is to be able to withstand it by having high Magic Defense. You can also use the Focus special ability five times to build that up, and you can use shell to further reduce it. Strong parties can double cast ultima and Copycat. Weaker parties should bring in Anima and immediately cast Haste and then Reflect. The Reflect will counter is Osmose and Drain attacks. All you have to do at that point is keep using Pain unless he casts Reflect on himself. If he does that, immediately dispell it. He shouldn't be able to touch you with that strategy.

Tanket:
Num Max Hits: 10
Steal: Light Curtain ( Aeon learns Protect add SOS Protect and Auto-Protect to armor), Lunar Curtain ( Aeon learns Shell, add SOS Shell and Auto-Shell to armor)
Loot: Defense Sphere x1/x2, Str+ weapons, Def+ armor
I recommend you get your party's strength up and use Break Damage Limit weapons. One Tanket's HP is low enough, it will use an attack called "rush attack", which continues to smack until such a time as one or more of your character or aeons are dead. Three characters with Break Damage add-ons to the weapons is a BIG plus here, as your best bet is to kill him BEFORE he gets an attack.

Fafnir:
Num Max Hits: 12
Steal: Gold Hourglass ( Aeon learns Delay Buster and Slowga, add Slowstrike to weapons, add Slowproof to armor), Stamina Spring ( Aeon learns Power Break and Drain, add Str +5% to weapons, add Def +5% to armor)
Loot: Light Curtain x20/x40 ( Aeon learns Protect add SOS Protect and Auto-Protect to armor), elemental attack weapons, elemental defense armor
This guy has a Triple Attack that does a lot of damage. You can use NulBlaze, NulShock, and NulFrost to counter the effects of the magic part of the attack. Weak parties should call in Ixion for this battle. Ixion can use Thundara to heal as needed and can attack several times a round if hasted. If you have enough Light Curtain items, teach Ixion Protect to make this go quicker. Note that if he uses Triple Attack, it will each up several of Ixion's turns. Strong parties should refer to the Tanket strategy (just kill him before he gets an attack.)

Sleep Sprout:
Num Max Hits:
Steal: Poison Fang ( Aeon learns Bio, add Poisonstrike to weapons, add Poisonproof to armor) Farplane Wind(Add Deathstrike to weapons)
Loot: Teleport Sphere x1/x2 ( Move to any node activated by an ally, add Evade & Counter to weapons), status attack weapons, status defense armor
As the name implies, this guy uses a sleep attack. He's got less than 99,999 HP, though, so one hit of that power will take him out. Weaker parties can use Anima with Haste.

Bomb King:
Num Max Hits: 5
Steal: Fire Gem ( Aeon learns Firaga, add Fire Eater to armor), Shining Gem ( Aeon learns Flare, add Magic Counter to a weapon, add Deathproof to armor)
Loot: Door to Tomorrow x1/x2 (Add Overdrive -> AP to weapons), Str+ weapons, Def+ armor
Unlike other bombs, this enemy grows after every third attack and does not self-destruct. If you've got armor that nullifies or absorbs fire attacks, that can make this battle quite a bit easier. If that armor also has Magic Counter Strong parties can take him out in 5 max damage hits. Weaker parties may need to call in a powerful Aeon and use haste/shell/protect. If your aeon can cast NulBlaze, skip the Shell and use that.

Juggernaut:
Num Max Hits: 13
Steal: Lunar Curtain ( Aeon learns Shell, add SOS Shell and Auto-Shell to armor), Shining Gem ( Aeon learns Flare, add Magic Counter to a weapon, add Deathproof to armor)
Loot: Strength Sphere x1/x2, Str+ weapons, Def+ armor
This enemy has a special attack called Salvo, which is preceeded by the phrase Charging. If you have Fire nullification or absorption armor, use that. Otherwise, when you see Charging, use NulBlaze or call in Ifrit. Deathproof armor can help against the Crush Spike attack (a Death attack.) If you have trouble with his armor, have Rikku use a Frag Grenade.

Ironclad:
Num Max Hits: 21
Steal: Lunar Curtain ( Aeon learns Shell, add SOS Shell and Auto-Shell to armor), Stamina Tablet ( Add Auto-Potion and HP Stroll to armor)
Loot: HP Sphere x1/x2, Str+ weapons, Def+ armor
Since this enemy is armored, using Celesial weapons is preferred (they inately ignore armor). You can use Armor Break, but it works like 1 in 20 times. A Frag Grenade will inflict Armor Break always, though. Evade and Counter is helpful. This enemy will counter attack after every hit with Reppageki. If your evade is high enough, it will miss. Weaker parties can have Auron use Sentinel with Protect to absorb his attacks. You can also call in Anima and have him cast haste and protect, then use pain. Attack will probably work, but doesn't do as much damage. The higher Yuna's evade is, the less likely it is Ironclad will even land a blow on an Aeon. Stronger parties probably already have Evasion high enough that most of his attacks will miss.

Original

Earth Eater:
Num Max Hits: 14
Steal: Gambler's Spirit 2x/4x (Adds SOS Overdrive to weapons), Lv. 1 Key Sphere
Loot: Fortune Sphere, Tripple Overdrive weapons, Auto-Potion armor
This enemy has two modes - standing and toppeled over (remember the Chocobo Eater?) When he's standing, hit him hard (over 100k damage) to topple him. He will counter every attack. If he's standing, he'll counter with a punch. If he's on his back, he'll reflect cast Flare at you. If can add Auto-Phoenix to the armor of a couple of characters, it will make this battle quite a bit easier - but don't forget to restock every so often if your'e grinding for those Fortune Spheres. FYI, the next enemy (Greater Sphere) drops armor that have Auto-Phoenix already on them. If he's on his feet when it's his turn, he'll punch a couple of times - with an instant death attack punch. If he's on his back, he'll get up during his turn (after struggling one time.) I usually save this enemy until my guys are at 255 in most of their other stats, then drag everyone back through the grid using a Luck Sphere on any empty nodes, and using Fortune Spheres to boost everyone's luck.

Greater Sphere:
Num Max Hits: 16
Steal: Gambler's Spirit 2x/4x (Adds SOS Overdrive to weapons), Return Sphere
Loot: Luck Sphere x1/x2, One MP Cost wepons, Auto-Phoenix armor
This guy counters with Ultima, so pay attention. He's also got a "hydraulic press" attack that kills your guys off straight up. Use a powerful Aeon, cast Haste, Protect, and Shell. Before he gets his turn, be sure to shield!

Catastrophe:
Num Max Hits: 23 (5 in first form, 18 in second)
Steal: Gambler's Spirit 2x/4x (Adds SOS Overdrive to weapons), Lv. 2 Key Sphere
Loot: Designer Wallet x1/x2 (Add Gillionaire to weapons), status effect weapons, status defense armor
Strong parties that have multiple characters with Break Damage Limit weapons shouldn't have too much trouble with this battle. Just Hastaga and Quick Hit over and over. After 5 99,999 hits, he'll open up. 18 more to kill him. By the time you've got everyone buffed up using the agility spheres you've won from a previous battle, you should be able to take him out before he gets a shot off. Weaker parties should rely on a powerful Aeon with Haste and Protect. Heal up as needed.

Th'uban:
Num Max Hits: 31
Steal: Gambler's Spirit 2x/4x (Adds SOS Overdrive to weapons), Teleport Sphere
Loot: Underdog's Secret x1/x2 (Add Double Overdrive to weapons), Triple AP/Triple Overdrive weapons, HP+ armor
When hit, this enemy will counterattack with Condemn - an attack that hits you with delay and removes any buffs you may have - unless your armor provides auto-buff (e.g., Auto-Haste). His attacks follow a specific pattern: Regular attack, Rainbow, buff (one of Protect, Reflect, Regen, or Shell), and finally Convergence. With High defense, his regular attack is easily handled. Rainbow attacks the whole party and can cause curse, sleep, confuse, darkness, and silence. Convergence attacks one party member (or Aeon) and does 99,999 damage. Sufficiently powerful parties can use Quick Hit and Heal up when low on HP. If you've maxed your Agility, he won't be able to get in a powerful attack. Alternatively, if you have high magic, you can haste your party and bounce a double flare off a reflected party member. However, I was unable to get an overkill this way - even with 5x Focus special ability. Weaker parties should use an Aeon, but the strategy will be a little different than normal. If you can't do a lot of damage with a regular attack, wait until you're more powerful. Since he nullifies your buffs, forget Haste/Protect and just attack. You can let a regular attack or Rainbow hit your aeon, but dismiss before convergence so it only kills one party member. Revive them and call your aeon again on the next turn. If your non-Aeon characters aren't attacking, you can haste them so your Aeon gets more turns to attack when you call them back. If they're powerful enough, the Magus Sisters can be a good choice here. Just ask them to fight otherwise Cindy will spend the whole time trying to auto-life while Sandy casts reflect - because he keeps nullifying it with the Condemn counter attack.

Neslug: Num Max Hits: 41 (but read on...)
Steal: Gambler's Spirit 2x/4x (Adds SOS Overdrive to weapons), Friend Sphere
Loot: Pendulum (Use 30 to Add Master Theif to armor), Piercing and Triple AP weapons, HP+ armor
For powerful parties, this shouldn't be a difficult battle. Just hastega then quick hit until it receeds into it's shell. After that, cast reflect on someone and double cast Flare at them (then copy cat) until the shell breaks. Then go back to quick hit. For weaker parties, this battle is more challanging. Having an Aeon on the field when he's inside his shell will cause over 100K HP to regenerate each turn, making it quite hard to get to his third stage. The only thing that works is having the Aeon cast haste, reflect, and then double cast flare. But if your other characters can do that, he'll heal for fewer HP per turn with them on the field than an Aeon. Things to consider: If you can make Silence Buster connect, you can prevent him from casting Curaga, but he'll still restore HP each turn while he's in his shell. If his slime attack is making it impossible to defeat him, try casting slowga on your party (yes you read that right; I found he never casts is when the party is in that state.) Just be sure not to do that if you've got someone with Auto-Haste armor.

Ultima Buster:
Num Max Hits: 51 (yeah, right...)
Steal: Gambler's Spirit 2x/4x (Adds SOS Overdrive to weapons), Lv. 3 Key Sphere
Loot: Winning Formula x1/x2 (Add Triple Overdrive to weapons), Triple AP, Triple Overdive, Overdrive-AP weapons, Break MP Limit armor (I've not found a use for this)
For strong parties this should be a reasonably easy battle as long as Wakka has break damage limit. Go after its arms first, then its head, then attack the body. The head is out of range for melee attacks, but Wakka, Aeons, or magic should make it possible to take it out. The arms and head have nothing to steal. Taking out the head is important because he has a really nasty attack that hits you with a lot of debuffs. If he gets three turns before you kill him off, his arms will respawn. I'd really recommend against trying this battle with a weak party, but if you can take out the head it should at least be possible. Hastega and Quick Hit with break damage limit weapons or a powerful Aeon (if you have lots of patience). If your magic defense is high enough, you can survive his Ultima attack. If your defense is high enough, you can survive his physical attacks.

Shinryu:
Num Max Hits: 21
Steal: Gambler's Spirit 2x/4x (Adds SOS Overdrive to weapons), Three Stars ( Aeon learns Doublecast, add One MP Cost to weapons add Break MP Limit to armor)
Loot: Wings to Discovery x1/x2 ( add Triple AP to weapons, add Break HP Limit to armor), Double AP weapons, Auto-Med armor)
This is a water battle, so you can only fight with Wakka, Rikku, and Tidus. I wait to do this until I have AT LEAST two Break Damage Limit weapons and those characters can do 99,999 DMG. He retaliates to any physical attack, so have Protect and Regen and be prepared to use a lot of Cure magic or items until you're super fast. The nasty attack is called Eraser and will eject one of your characters from battle. It really sucks if it ambushes you and does that right off the bat. There's another attack called Shining which does a lot of non-elemental magic damage to all your characters. Be sure you're decently healed up before its turn!

For a decently powerful group, this should be doable. Hastega and Quick Hit, then heal as needed. If you don't have break damage limit weapons, this will be a long, tough slog. At 2 Million HP, you'll need over 200 hits of 9,999.

Nemesis:
Num Max Hits: 101 (yup)
Steal: Lv. 4 Key Sphere, Warp Sphere
Loot: Warp Sphere x1/x2, Break Damage Limit weapons, Break HP Limit armor
This enemy doesn't just show up when you've captured everything. You have to beat everything in the arena. After that, save, then talk to the arena owner to unlock this battle. If you need Lv. 4 Key Spheres you can steal them from this enemy at the cost of an Ultima counter (oddly, that doesn't happen if you Mug instead of Steal). That being said, you can also just bribe the Chimera Brain enemies in the Calm Lands 250,000 Gil to obtain one or two of them so this isn't exactly the best time for that. The attack pattern of this enemy is Ethereal Cannon (non-elemental attack on one character), Ultra Spark (party attack that deals damage and inflicts Poison, Curse, Slow, and Power Break), Physical Attack (but sometimes he will add another physical attack in there for good measure). After 8 to 10 turns he'll cast Armageddon (party attack that does a guaranteed 99,999 damage - make sure an Aeon takes this hit or you have auto-life!)

By the time you get here, you're probably a pretty buff party. I don't recommend this battle with a weak party. Hastega and Quick Hit. When he's about to attack, swap in Yuna and have an Aeon take the hit. For its turn, don't bother having the Aeon shield. Just have it haste itself to maximize the number of turns you'll get when (not if) it's subsequently killed.

When you've beaten this guy, you'll have defeated all the enemies in the game (except Yu Yevan). You should get the Mark of Conquest to commemorate the event. I've been able to defeat him after about 70 hours of game play. YMMV.