The following are known Action Replay Codes for Banjo-Kazooie: Grunty’s Revenge 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
d03835b6
637b5ef5
eb758fe2
783282e7

Infinite Health
ed55d6ec
b93c43bf

Have All moves
2cba1e26
0227e912
6e850630
f4c6fc62

Always Play as Banjo
7c412e08
b29935ea

Always Play as Mouse
bbb09e51
c3cc525e

Always Play as Candle
e29a3fc6
277b559f

Always Play as Tank
b107a9f6
d115fbfb

Always Play as Octopus
891499d1
378b671a