At the PRESS START screen do these steps carefully!

1. Press and HOLD A, press and HOLD B, press and HOLD C
2. Then, release C, release B, release A.
3. And then DO this: B, A, B, Y, HOLD X, Up, HOLD Down, release X, release Down.
4. A voice should say "you are on the wrong team".

The above 3 codes are from Emperor Cybersurfer