Things You'll Need
Instructions
Insert your Action Replay into your Game Boy Advance and insert "Pokemon Sapphire" into the Action Replay. Turn the GBA and the Action Replay on. This will load the Action Replay codes for Pokemon Sapphire.
Select "Choose One" and scroll through the list of cheats for the game. Select a cheat that you want to enable. Repeat the process to select multiple cheats if you want.
Press "Start" to start the game with your selected cheats enabled.