The following are known Action Replay Codes for Shaman King: Master of Spirits 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
2c045781
7e0b3750
a9383d5d
5cb6d151

Infinite Health
5fd4caeb
76ef99f9

Max Health
c1307247
1918ea59

Infinite Energy
55d50528
75c82beb

Max Energy
4fffa745
3ccf09b8

Max / Infinite Money
ca729c62
0e58e9b5

Have Low Game Time
1f5fd744
2c74fcc5

Have Super Jump
fcc30179
67fae75e
cbded871
c9821a54