The following are known Action Replay Codes for Tom and Jerry in Mouse Attacks 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

Infinite Items
910931c0
910932c0
910933c0
916348c0

Infinite Lives
9105b1c1

Infinite Health
916339c0

Max Pickup
916339c0