The following are known Action Replay Codes for Disney’s The Lion King 1 1/2 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
f355c670
b8da9253
897e4205
d2223a34

40 Bugs Every Level
67def1e5
60e7d544
68dbe8f5
43872c22

Open All Levels
629563e4
526a6a61
dab9079e
d157da12

Note: This code works after a level is loaded.

Infinite Hearts
ee62aa45
b796f03d