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OSGKO is impossible, so what I am doing is sending Kimahri into Wakka's SG section once he finishes his own. However, I will not be teaching Kimahri any of Wakka's abilities. Sell all potions and hi-potions to make auto-potion effective. Make sure you have the Spirit Lance and your Shaman armlet equipped and enter the battle. Switch a character for Kimahri at your earliest opportunity. Don't bother with ODs in this battle. Attack him a few times to trigger form 2. Try to kill him before TG. If you don't, make sure Kimahri is at max HP, because if TG triggers auto-potion, and you are inflicted with zombie... BFA's TG is stronger in form 2, but no longer inflicts zombie, so it's not a threat. Continue exchanging blows with BFA (and healing if needed) and eventually BFA will start to use UJS. (When his HP falls under 60000) Keep it up and eventually you will win.