Solution 1: First at the beginning of the game while your still Roxas choose the sword. Then level up to mid 60s and get berserk charge. Equip it and while fighting Sephiroth use trinity and berserk back to back to beat him. Also make sure you have plenty of Hi potions.
Solution 2: Use the Ultima weapon.
Solution 3: Level up to level 99 and kick his azz.
He dissapears with Cloud
Get Kingdom Hearts 2. That's what I did. Or you can try and beat sephiroth and all those extra things.
You cannot get Mickey's Keyblade in Kingdom Hearts II.
on Kingdom Hearts 1 i have no clue but on Kingdom Hearts 2 after you beat sephiroth go talk to cloud and he will give you a keyblade called Fenrir
2 ways cheat via gameshark or just practice
Yes, Sephiroth, originally from Final Fantasy VII, appears in both Kingdom Hearts and Kingdom Hearts 2.
around 29 in kingdom hearts 2
Once you beat him, he goes away.
i did mine at level 56....i don't fight heartless or nobodies much..but anyways..56 is the best lvl...at the point on how you beat sephiroth
Defeat Sephiroth.
You cant
Nobuo Uemastu.