The codes should work with the region specified but may work for other regions as well.
Device Compatibility: Action Replay, CodeBreaker & GameShark
Infinite Health P1
800e63241000
Infinite Health P2
800e713c1000
Infinite Health P3
800e7f541000
Infinite Health P4
800e8d6c1000
Press Select For All Cars
d00e65bafffe
800b30140800
Quick Win
800e66e40002
All Cups And Tracks Unlocked
800b30100006
Weapon Modifier P1
800e673200xx
Weapon Modifier P2
800e754a00xx
Weapon Modifier P3
800e836200xx
Weapon Modifier P4
800e917a00xx
Homing Missile
01
Knuckles
02
Spread Missiles
03
Machine Gun
04
Grenade Launcher
05
Mine
06
Oil Slick
07
Nitro
08
Energy Shock
0a
Cruise Missile
0c
Flame Thrower
0f