Spacewolf said:
Yea Phantom went down easier than a Neo Shadow, didn't even get past 11 on Pan. All that's left now is Sepi who from what I've heard is the toughest.
Sephiroth is the strongest enemy in Kingdom Hearts 1, and Final Mix, and he's also one of the most difficult Super Bosses in the Kingdom Hearts series in general. For that one, have a long reaching Keyblade, in this case Ultima, have Guard and Slap Shot, use the invincibility frame that Leaf Bracer gives you for Curaga. As for equipment, make
sure you have the Ribbon as Sephiroth's attacks are all Dark-based and the Ribbon reduces Dark Damage by 80%. Have Sora equipped fully with Elixers and only use them in emergencies. Ability wise, Strike Raid provides Sora with an invincibility frame he can use, and have MP Haste and Rage equipped as well.
The beginning of the battle when you attack Sephiroth it looks like you're not doing damage, but you are and it's just a shield he has, and after a while you'll start damaging him. His most devastating attack is Heartless Angel. He'll telegraph that attack, but don't get caught by it. You can cancel it out by hitting him at least once. What Heartless Angel does is it reduces you HP to 1 and gets rid of all your MP. He usually then teleports and attacks you after that.
Good luck with that evil one, and when you beat him leave the World through the Colosseum door and not by boarding the Gummi Ship from the save point because you'll miss the added cutscenes.