Have the Game Boy Advance game Kim Possible: Revenge Of Monkey Fist in the cartridge slot.
Commando Costume
Have the Game Boy Advance game Kim Possible 2: Drakken's Demise in the cartridge slot.
Super Suit Costume
Have the Game Boy Advance game Kim Possible 3: Team Possible in the cartridge slot.
Various Codes
Unlimited lives - Hold L + R and press Y, Y, Y, X
99 lives - Hold L + R and press A, A, A, Y, X, Y, B, A
Xtra life - Hold L + R and press A, A, A, Y, X, Y
Full health - Hold L + R and press A, A, A, Y
All gadgets - Hold L + R and press Y, Y, X, B, A, Y, Y, A
All clothes - Hold L + R and press B, A, X, Y, A, B
9,999 credits - Hold L + R and press Y, Y, X, B, A, Y
Invincibility - Hold L + R and press Y, Y, Y, X, A, B
Stage select - Hold L + R and press X, Y, X, A, X, B