When you defeat Sephiroth, Tifa gives you the Fenrir Keyblade.
You cannot get Mickey's Keyblade in Kingdom Hearts II.
In order to obtain the Fenrir keyblade, you must defeat Sephiroth.
The BEST keyblade is based on opinion, although the strongest (in terms of strength) is the Fenrir Keyblade, obtained after you defeat Sephiroth.
Beat Sephiroth also its Cloud's sword you get not Sephiroth's
Sephiroth could never have the Keyblade. Remember when Sora gave Jack the key and he did that trick? Not only that but Sephiroth is a being of darkness, with a weak heart at that.
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
Fenrir
You Beat Sephiroth
Whether a keyblade is 'better' than the other is slightly based on opinion. If you're asking what the strongest keyblade is, then the answer is the Fenrir Keyblade which is achieved by defeating Sephiroth.
it looks like a dragon key and it has berserk
No. Just No. Sephiroth is to purely awesome.
Sora. (Perhaps I'm answering this too obviously). Obtained by defeating Sephiroth in Radiant Gardens, then talking to Cloud. Cloud contronts Sephiroth, Tifa arrives, and Cloud and Sephiroth leave, leaving Tifa by herself again. She gives Sora the Fenrir Keyblade and strength 7 as thanks.