The following are known Action Replay Codes for Astro Boy: Omega Factor 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
Master Code – Must Be On
0b2c9308
74f50629
980aad57
558019ae

Infinite Health
2d0fcdf2
843053c7

Invincible
2d887511
81a6c48a

Infinite EX Points
64c01ec5
50050a26

Full EX Gauge
ed80a346
5f012b85

Max Score
a3b1c8b0
90f23b49

Always Low Time
638f152c
40acffba