I'm not sure, but all the teams in the game are actual teams. So each new event I due I'm sure to add at least 1 player from a team I haven't used. I would do the smart thing and keep a list, but simply but. Use at least 1 player in a match from50 different teams. Hope this helps.
Top 3(in order):GH2~GOW~Beijing 2008
Best movie ever: Saving Private Ryan
#15 to GH:A 1000
#50 to Beijing 2008
#66 to SC4
Funeral For A Friend=Greatest Band