The following are known Action Replay Codes for Tom and Jerry Tales 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
9e647b29
a54e3dec
e12cdbdf
049d2c1f

Infinite Health
9ff05e0b
78fb469d

Infinite Eggs / Bottles
d0799a52
80580d3c

Have Cheese / Fish
d13100f6
e8080a77

1 Hit Boss Kills
bf626089
90a2cb86