I can't remember the exact level, but it was around:
Beating Xemnas: 40-55
Beating Sephiroth: Like 70. Yeah, I sucked, but once I realized his patterns I could beat him extremely easily every single time.
Right now: I'm on 99, just messing around. I've saved it to where I haven't beat sephiroth so I can keep beating him up.
-Sig credit goes to PhilXZ. The pic of Kairi's head was cropped by Rathalos9. Apparently no one else can crop Kairi's head...