The following are known Action Replay Codes for Ultimate Fighting Championship on Nintendo Game Boy / Color (GB / GBC). These codes were also known as GameShark Codes and in most cases will work on both devices.

Device Compatibility: Action Replay & GameShark

P2 Infinite Health
012b2bc7

P2 No Health
01002bc7

P1 Infinite Health
012b0bc7

P1 No Health
01000bc7