The following are known Action Replay Codes for Legend of the River King GB 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 Health
01ff25d2

Infinite Gold
01ff29d2

All Fish
01FF26D2

Funland
01FF27D2
01FF28D2