The following are known Action Replay Codes for Disney/Pixar Finding Nemo 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
b97ccd42
13d1ce22
1e1ec75a
bdad67ff

99 Gold Rings
4fa6a1b7
3b9d480b

Have All levels
bb255d97
2533dbe9

Note: This takes effect after a level is loaded.

Full Gallery
ed503c33
ff7525f2

Turbo Speed: Race Levels
a43bf37c
4e518296

Infinite Health on First Day
842ba59c
37d4ddcd

Infinite Health on Drop Off
cfff7a4d
7aae98eb

Infinite Health on Minefield
b276e9f1
b85a269a
85ac4837
ce202b45

Infinite Health on Abyss
d7b2dd50
b58c39ab

Infinite Health on Jellyfish Forest
22013797
f2d6715d
42ac5fa4
deaac7b5

Infinite Health on Filter Block
bd391187
e2141dc5

Infinite Health on Treatment Plant
774290c2
4a30bc56
29674dac
598cdc08

Infinite Health on Finding Father
75098b8a
c94b6e60

These codes are for the U.S. version of the game.

Master Code – Must Be On