i beat riku a whole bunch of times, like 50 or something.
i beat sephiroth when i was lv 40 something(so i could gain levels)
i used the ultima keyblade
i had equipped 2 crystal crowns and a protega chain
i had only hi-potions
got all puppies
got all spells
got over 100k money
beat all 4 special bosses
beat timed hades match in like 30 some minutes or so.
all characters lv 100
got more health and defense than goofy
got more magic, magic attack, and magic defense than donald
beat leon first time without getting hit
beat cloud first time without getting hit
beat leon and yuffie without getting hit
beat cloud and leon without getting hit
beat cereberus first time without getting hit
beat riku(when he had the keyblade) i got hit twice
beat darkside without getting hit (so easy)
beat hades without getting hit
beat captain hook without taking damage(i got hit once)
beat stealth sneak without getting hit
and a lot more bosses