Instructions
Run Visual Boy Advance.
Click "File," then "Open" to load a Gameboy game. You cannot access the Gameshark without loading a game.
Click "Cheats," "Cheat List" and then "Gameshark."
Visit a website that supplies Gameshark codes (see "Resources").
Go back to Visual Boy Advance. Copy the Gameshark code, paste the code into the blank field and then click "OK." The code is listed and the status for the code should say "E," for enabled.
Click "OK" to exit the Gameshark.