The following are known Action Replay Codes for Jonny Moseley: Mad Trix 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
ef26cc1b
c00feb00
0a9f9001
44a82c68

Turbo Mode
1cc6484f
3fca038f

Max Score
86b34046
cb9e46ab