All-Star Baseball 2002 Codes -

Unlock Hidden teams:
Choose exhibition mode. Press + over and over again, and the Dingers and the Islanders teams will be unlocked. When you hear a sound you will know you have entered the code correctly. The Dingers can also be unlocked in batting practice mode. Press + + + at the batting practice team selection screen and that team will appear next to the Cooperstown Legends.

Alternate uniforms:
Press or in exhibition mode.

For alternate uniforms during season mode, press or + or at the controller selection screen. Remember you can only be done on a Sunday.