Here it is. Pokemon Fire Red MasterCode: D1 A EC8 Wild Pokemon Modifier Code: This part requires it's own special. Game Shark Codes for Pokemon FireRed (Gameboy Advance). Click for for instructions on using Gameshark codes. Popular; Latest; Your Codes ; Search / Filter. A. You'll need to use a combination of codes. First, You'll need to catch a Mewtwo using the Wild Pokemon Modifier code. Then use the Easy.