Cheats for Ready 2 Rumble Boxing Round 2 (GBA)

Michael Jackson:
Highlight the "Arcade" option at the main menu, then press Left(2), Right(2), Left, Right, L + R.

Shaq:
Highlight the "Survival" option at the main menu, then press Left(4), Right(2), Left(2), Right, L + R.

Rumbleman:
Highlight the "Championship" option at the main menu, then press Left(2), Right, Left, Right(2), Left, Right, Left, L + R.

Knock opponent out of ring:
Get three Rumbles in a row without using any of them. Knock down your opponent two times, then use your rumble and a combo. If done correctly, he should fly out of the ring.