How to beat Sephiroth in Kingdom Hearts??

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