The following are known Action Replay Codes for Shrek 2 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
5fe48c11
30bc27cf
9b778848
ab9184dd

Infinite Health
7532eb5a
bb09c318
191ad98e
3b556ac9

All Levels Open
a85794ff
b45079da
eaef609f
d97a4dc3
5ebabab3
3de94322
eaef609f
d97a4dc3
c2468617
73c77449
eaef609f
d97a4dc3
2479850e
20ab8a53
eaef609f
d97a4dc3
8d9aabe7
dcd90e8e
eaef609f
d97a4dc3
0166b4a9
eae8d2f8
eaef609f
d97a4dc3

All Coins Collected
bdf9e5e3
49499696
81c0dd14
6c77c27f
b7313875
f97c4942
81c0dd14
6c77c27f
61059716
34e165f2
81c0dd14
6c77c27f
9b09b55e
62efa353
81c0dd14
6c77c27f
7f1233f6
1bf91869
81c0dd14
6c77c27f