User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-4563270-20140916131653/@comment-184612-20140917054234

Notyloise is correct. There are only certain models that can be used, depending on weapon type. Some are of monsters that aren't even in the game. Roughly 5 or so per weapon type. It's also dependent on the monster you're facing.