New Teams:

Perfect Striker contains two additional, hidden teams. There are two ways that you can get these two new teams:

Play through and beat the league mode.

or

Enter this code (at the title screen):

Up, L, Up, L, Down, L, Down, L, Left, R, Right, R, Left, R, Right, R, B, A, and then hold down Z and press Start.

Big Headed Players:

To get "big headed" players in Perfect Striker, just enter the following code at the title screen: Top C, Top C, Bottom C, Bottom C, Left C, Right C, Left C, Right C, B, A, and then hold down Z and press Start.