Kingdom Hearts Birth By Sleep: Mysterious Figure Battle English (HQ)
This guy is a pain in the A** especially when you use Terra seeing as he can't dodge roll...To challenge him, you need to complete the final episode and to do that you need to complete every character's story and get all of Xehanort's reports.
I already beat him before so I already have the no name keyblade. Like Vanitas's lingering spirit, you can vs him as many times as you want. The keyblade I used was the Ultima Weapon. To get it, you need to have an arena level of 30 and beat the final arena level which is defeating all of the arena bosses. I'll make a video on that battle soon.
Some other defeated this guy using only Fire Surge. I found thunder surge to be more effective so I used that. My deck is structured like this
-thunder surge
-thunder surge
-thunder surge
-thunder surge
-curaga
-curaga
-curaga
-curaga
This is a really hard battle so I suggest that you should be above level 40. I was level 65 when i first beat him. I also have all my abilities maxed out.