Note: This game is also titled Jyuouki: Project Altered Beast.
Successfully complete the game to unlock options for Elevator Of Doom mode, All Boss Fights, and All Cinematics.
Locate the Unique that is hidden a small room in Area 15, behind a glass panel. You must have already unlocked the Grizzly form first to defeat it. Just use the charge attack to fart in the hole that it is using to breath.