The following are known Action Replay Codes for Yu-Gi-Oh! World Championship Tournament 2005: 7 Trials to Glory 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
e8ba2bfe
135ab6c1
7e21aa0b
d9313384

Max / Infinite Duel Points
8052849c
e5242335

Infinite HP
449e38b3
249f6bca

1 Hit Kills Enemy
9d641718
86eff6d0
64fab38b
c5edbf16

Have All Cards
2c9eca5a
4099b114
7abc1478
c514ab27
0a00f5ea
dd9a8063
7abc1478
c514ab27
d6fd2cf6
3f26018e
7abc1478
c514ab27
25f0fd5b
132153fd
ed304b37
b44be836