[ShadowPlayer]

enter this master code:
Master Code for Fire Red
72BC6DFB E9CA5465
A47FB2DC 1AF3CA86

then enter this:
Fire Red
17543C48 E65E0B97

and finally enter this:
Charmander
DB8C60CD 81FD6AA7

that are GAMESHARK codes,and they are fully working to me