The following are known Action Replay Codes for ZooCube on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
3f7b3bda
2545ad40
d99a9ab8
92e78abb

Press AR Button: Slow
dbba3a89
4cb74b94