Dynamo Pad

@DivinePony1000 I never got a chance to fight Sephiroth as he was always so difficult to fight. I remember defeating the ice titan, but I actually didn't know you got a keyblade from that boss. I guess it's been such a long time since I had fought that boss. Still, that's pretty cool.  

Hmm...I would say either Oathkeeper, or Oblivion. Since it has two form changes and adds some pretty good combo attacks in their regular and transformation forms. The Ultima weapon is a good option, but the secret boss is pretty tricky at times.

@Dynamo Pad I had to create Ultima Weapon again and honestly it's not that difficult! KH1 still has the most difficult Ultima Weapon to unlock!

@DivinePony1000 Awesome! I also agree. I think you had to synthesize every item, before being able to get the Ultima Weapon. KH1 was definitely the most difficult to get that keyblade, in my opinion.

Also, I completed the Re: Mind story mode and I got Oathkeeper!  

I'm going to try the organization data battles later. Also, I learned something about the secret boss. Would it be okay if I can let you know? I just saw a video and I was surprised.