Final fantasy X

Now be prepared for a tough battle. Cast protect, Haste, and Shell on every party member available, or at least every party member that can mean something to you in this battle. Use all your Overdrives that you have been saving up and talk with Seymour to boost stats. The Cross Cleave attack is the attack to watch for. Seymour will sometimes cast Dispel on all party members before using it, thus nullifying Protect. The Cross Cleave can deal up to 3000 HP of damage against weaker characters and about 2000 to the more durable characters. Unless you've been stat boosting like crazy, chances are you won't survive after this. Use Bio on Seymour, though sometimes it may not connect since he is highly resistant to the magic attack, but be persistant in it. It'll be the key to your victory. Watch for Antropy that puts one of your characters in Zombie Status...use a Holy Water, Remedy, or Esuna to heal that character...otherwise the character will die from the cast of Full-Life.

Now depending on how you leveled up Kimahri and where you had placed him on the Sphere Grid can make Kimahri barely useless, or incredibly useful. My Kimahri did about 3700 HP of damage per attack after talking with Seymour, but I also used the Friend Sphere to move him into Auron's grid area. I highly suggest that you level up before coming back and trying again if you lose. Chances are that you lost because you were too weak rather than lack of good decision making. Keep casting Haste and Protect on all party members, it's a must...even if Seymour does nullify the attack. Cast Dispel(if you have it, otherwise shame on you) on Seymour when he casts Protect and watch for your summons...they'll be banished everytime you bring them into battle...but your main goal is to use them for their Overdrives and nothing else. Use Diamond Dust twice if you can, it always deal 9999 damage. If any of your characters are strong enough, you can keep attacking Mortiorchis, and assuming you do over 4000 HP of damage(like my Auron does, or Kimahri when he talks with Seymour), you can make this a quick battle...but be sure to always keep Protect up.

When the Mortiorchis starts to attack on its own, take it down immediately to disrupt the attacks. Watch for the Total Annihilation attack, it hits about 20x(I didn't bother to count) and each hit does about 400-800 HP of damage. Having Protect will help greatly. When Rikku's Mix is available, combine the Lunar Curtain and Light Curtain to give the party Super Mighty G. Protective spells play a huge roll in this battle, and so does using all of your Aeon's overdrives. If you can successfully connect with all 5 of your Aeons' Overdrives, then you've pretty much won the battle. You should do about 45000 HP worth of damage to Seymour, which is actually a little more than that each time since Mortiorchis drains 4000, 3000, 2000, and then 1000 HP consecutively for the remainder of the battle. So that is about 55000 HP of damage, and if both your Kimahri and Auron can do at least 3000 a piece before Protect is cast on Seymour, that's 61000. So all you have to worry about is just 9000 HP worth of damage...easier said then done but eh, I've done it. =D Also cast Dispel when he casts Protect.

Now go and save your game. I'm assuming most of you wouldn't w

jep,siinä on just kova tappelu,kaikille haste,protect ja cheer auttaa paljon kun attack ja defu paranee sen avulla. ja mitä aioneita sinulla on? minulla on kaikki mahdolliset (valefor,ifrit,ixion,shiva,bahamut,yojimbo ja magnus sisters) mutta joka aion auttaa jollakin tavalla varmasti,jos sillä seamorilla on ihan joku kunnon death move niin pistä joku aion sen eteen niin se ottaa damaget sinun puolesta.ja sulla on auto-life niin se on SUURI apu kun kaikki nousee heti kuolleista.ja ota kaikille overdrive täyteen jo ennen sitä tappelua niin sekin auttaa ja jos joillakin sattuu olemaan break damage-,health limit niin se oikeastaan sinetöi homman kunhan attack ja defu on hyvät. enempää en osaa auttaa mutta käy youtubesta kattoon siellä on hyvin näytetty miten ne taistelut hoidetaan...