Sephiroth bestaat alleen in expert check this
'This FAQ was written for the EXPERT version of the game. Because I did not
play NORMAL, some of the strategies (especially concerning how much life
Sephiroth has) may be slightly off. However, the following strategies work for
both EXPERT and NORMAL, you'll probably just do more damage on NORMAL, as well
as take less.
Sephiroth is an optional boss in Kingdom Hearts. He is accessable only after
unlocking the Hades Cup. He'll be right below the Hades Cup inside the ???? match
when you first unlock it. After that, it will turn into the Platinum Match. Be
prepared for this match! Level requirements will depend on skill level, but once
you see his pattern of movements, you can defeat him easily at lower and lower
levels. I took him out on Expert at level 52. Was it easy? No. But being level
100 won't give you that much more of an advantage, unless you severely lack defense
and HPs. That being said... equipment!
'