if u live in the US and over there, then u'll have the US version without dark aeons and ribbon. If u live in Europe or anywhere else really u'll have the international version. this has dark aeons and ribbon.
another way u can tel is to look on the box...
if u want to totally complete the monster arena u need to capture 10 (the limit) of all the monsters that can be captured. this will create all the monsters in the area, species and original arenas and after beating them u can fight Nemesis <img src="/images/graemlins/laugh.gif" alt="" />