The codes should work with the region specified but may work for other regions as well.
Device Compatibility: Action Replay, CodeBreaker & GameShark
P2 Never Lose
d00a1f280001
800a1f280000
P2 One Match Win
d00a24fc0000
800a24fc0001
P2 Ultrafast Win
d00a24fc0000
800a24fc0002
Stop Timer
8009eb440062
Hit Select for 00 Time
d00d86c2fffe
8009eb440000
Sudden Death Mode
d009eb440019
800a1e5c0001
d009eb440019
800a24320001
P1 Infinite Counters
800a1f400000
P1 No Counters
800a1f400003
P1 Max Super Meters
800a1f381400
800a1f3a1e00
800a1f3c2800
P1 No Super Meters
800a1f380000
800a1f3a0000
800a1f3c0000
P2 Max Super Meters
800a250c1400
800a250e1e00
800a25102800
P2 No Super Meters
800a250c0000
800a250e0000
800a25100000
Unlock Toad
800be56cffff
Unlock Mystique
800be56effff
Unlock Sabretooth
800be570ffff
Unlock Magneto
800be572ffff
P1 Ultrafast Win
d00a1f280000
800a1f280002
P1 Infinite Health
800a1e5cb400
P1 50% Health
800a1e5c5a00
P1 Low Health
800a1e5c000a
P2 Infinite Health
800a2432b400
P2 50% Health
800a24325a00
P2 Low Health
800a2432000a
P1 Never Lose
d00a24fc0001
800a24fc0000
P1 One Match Win
d00a1f280000
800a1f280001