The following are known Action Replay Codes for Fantastic 4 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
82481deb
38d5f48b
70e33922
b22eba78

Infinite Lives
6fb139bf
fd57c350

Infinite Health
c228ae27
d898d696
d0e34d66
5796a7d3