The following are known Action Replay Codes for Scooby-Doo and the Cyber Chase on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
37d29a1c
0c3c0246
4c8e13d9
5a612ad0

Infinite Health
9730eef1
052c8dec

Infinite Lives
6ca183fd
9b7db671

Infinite Disguises
223b5c6e
fc8dbc2b