The following are known Action Replay Codes for Planet of the Apes 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
169427ac
4f56fe63
659283af
621db3dd

Infinite Health
7c1d5101
3627c6d3

Infinite Pistol Ammo
82831b58
d8a686e8

All Flags
21d113fe
4551362c

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