While playing the game, hold L + R and press Y(3), X.

While playing the game, hold L + R and press A(3), Y, X, Y.

While playing the game, hold L + R and press A(3), Y.

While playing the game, hold L + R and press Y(2), X, B, A, Y(2), A.

Have the Game Boy Advance game Kim Possible: Revenge Of Monkey Fist in the cartridge slot to unlock the Bueno Nacho costume.

Have the Game Boy Advance game Kim Possible 2: Drakken's Demise in the cartridge slot to unlock the Commando costume.

Have the Game Boy Advance game Kim Possible 3: Team Possible in the cartridge slot to unlock the Super Suit costume.