How to beat Sephiroth in Kingdom Hearts??

anda are talking about Kingdom Hearts I and not II right?I will give anda both answers.First anda must have plenty of Elixirs atau Hi Potions with anda because the "Descend Heartless Angel" alih leaves anda with 1 HP and no magic!!!No magic means no Cure and no Cure means no lebih HP.You can stop his spell before he casts it sejak hitting him!In Kingdom Hearts II anda need the Aerial Dodge ability (you get that after leveling Master Form [Master Form levels up when anda get Drive Orbs]) to reach him.In Kingdom Hearts I anda must be lucky enough atau Sephiroth be fool enough to teleport behind anda before he cast the spell.If he casts the spell go away from him as far as anda can and give a Hi Potion to yourself.Better have it in the shortcut menu.Hope I helped ;)