They are not case-sensitive and you do not have to input the spaces between the numbers.
The Pokémon Fire Red cheat codes listed below can be used with GameShark or Action Replay accessories for the Game Boy Advanced (GBA). Get GameShark and Action Replay Cheat Codes for Fire Red There are several Pokémon Fire Red Shiny cheat codes available on GameShark and Action Replay. Part 2: How to get the cheat code in Pokémon fire red?