Can't beat sephiroth

Answer from: big milk
Get the ultima weapon and be level 76 with trinity limit equipped and have all item slots full with elixars and keep hitting him. do not let him use the "fire pillars" or that one "angel" attack because it will bring your health down to one.

Answer from: jac
O.k. here's what you gotta do do any magic until your all out then start the fight when sora is out of magic he does a endless combo that's why you need to run out of magic secondly you have to use drives (which ever one you like best). and hve mega-elixirs, hi-potions and mega-potions that's how i beat him....

Answer from: awesome~me;]
I say block all attacks, equip the most powerful weapon you have, attack relentlessly-except for that one attack with alot of flames that draws you tawards it-and if your in red,run around while giving yourself a potion, hi-potion, or elixer.never stop moving!!!!!!!!!!!

Answer from: kh2fan
You must be at level 75 and equip berserker, oblivion, explosion they might be helpfull

Answer from: eraqus
First question: it took me about an hour. i'd say just practice a lot and get used to the fast pace battle. customize sora until you're happy, then go back to the crystal fissure and save so that the next time you die you won't have to adjust yourself again. and make sure you have either quick run, aerial dodge, or glide.

Second question: idk use gameshark. he's only in the beginning.