The following are known Action Replay Codes for Pokemon Pinball 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

Ball Saver Always On
91ffa4d4
91ffa3d4
91ffa2d4
91ffa1d4

Infinite Time
91057ad5

Infinite Dual PIKACHU Kickback
01291dd5

Get 9,999,999,999,990 Points
01291dd4

Infinite Balls
01029dd4