He's just a side boss, so you don't do anything else relating to him. Just carry on finishing the game.
You can get it by defeating Sephiroth in Radiant Garden.
Yes, Sephiroth, originally from Final Fantasy VII, appears in both Kingdom Hearts and Kingdom Hearts 2.
around 29 in kingdom hearts 2
Defeat Sephiroth.
You cant
He dissapears with Cloud
You cannot get Mickey's Keyblade in Kingdom Hearts II.
Nobuo Uemastu.
I don't think Sephiroth is in that game.
Get Kingdom Hearts 2. That's what I did. Or you can try and beat sephiroth and all those extra things.
nobody knows
You have to fight him and then go talk to cloud