Things You'll Need
Instructions
Insert your "Pokemon Emerald" game into the game slot of the Gameshark.
Insert the Gameshark into the game slot of your Gameboy Advance.
Make sure the switch on the Gameshark is set to "on" and then turn on your Gameboy Advance.
Wait for the Gameshark menu to load and then select "Pokemon Emerald" from the list of games by moving the scroll arrow over the game title and pressing "B". This will bring up a list of cheats that are available for you to use in the game.
Select the cheats you want to use in the game by moving the scroll arrow over the name of the cheat and then pressing "B" to highlight it.
Press "Start" once you have finished selecting the cheats you want to use. The game will then load and you will gain any advantages or abilities that come with the selected cheats.