Here are some cheats and tips for the game Shark Tale.
Invincible Oscar:
Hold L and press A, X, A, Left(2), Y, R, Down, Y(2) at the
controller selection screen.
Attack mode on at all times:
Hold L and press X(4), A, X(3) or X(4), A, X(4).
Two extra Clams and fame:
Hold L and press X(2), A(2), X, A, X(2).
Replace all Pearls with Fish King coins:
Hold L and press X, A, X(3), A, X(2).