Forget about the evil Chocobo race or butterflies! It's better and less frustrating to make the ultimate weapon for Tidus and Kilmalri yourself.
Tidus's custom "Ultimate Weapon" now has Break Damage Limit, Triple Overdrive, Double AP, and One MP Cost.
It's not that hard to get necessary items:
Triple Overdrive: Winning Formula x30 (You get 99 by completing one of the Arena quest)
Double AP: Megalixir x20 (You get 20 by bribing Varuna in Omega Ruins)
One MP Cost: Three Stars x20 (If you have master thief you can steal around 3 Three Stars from Shinryu each time you fight him)
Break Damage Limit: Dark Matter x60 (You get 99 by capturing 5 of each fiends)
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All my characters have 180+ strength and can kill Shinryu in less than 3 minutes, using Wakka's Attack Reels and Tidus' Blitz Ace. Three of my characters already have Break HP Limit!
Life is good!
