Instructions
Insert "Pokemon Sapphire" into the GameShark and then the GameShark into the Game Boy Advance.
Turn on the Game Boy Advance and wait for the GameShark menu to appear.
Enter the "Master" code first to unlock the codes in the game: 9E6AC862 823AB7A88365F8FA 817CF3E9
Enter your selected modifier code into the GameShark and begin your game. The modified Pokemon will now appear in the wild.