Things You'll Need
Instructions
Place the Gameshark cheat cartridge in the cartridge slot of the Gameboy Advance. Place the Pokémon game cartridge inside the slot provided on the Gameshark and turn the cheat cartridge on. Switch on the Gameboy Advance to boot from the cheat cartridge.
Use the digital pad of the Gameboy Advance to enter the master code for the game. This is a Gameshark code that will activate and enable all the other codes for the game. The Gameshark website has a complete list of all the Pokémon master codes. Enter them exactly as they are shown on the site.
Use the digital pad of the Gameboy Advance to enter the "Infinite Master Balls" Gameshark code. The code will be different depending on the version of the game you are playing. The code for each of the Pokémon games can be found on the Gameshark website or any cheat website like PokeDream.