Therefore, you can't type Action Replay codes into Pokemon FireRed.
If you're looking to cheat or modify the game, there are other ways to do so, such as:
* Using an emulator: Emulators allow you to play Game Boy Advance games on your computer. Some emulators have built-in cheat functionality, allowing you to input codes directly into the game.
* Using a save editor: Save editors allow you to modify your save files directly. You can use them to give yourself items, Pokemon, or even change your character's stats.
However, using these methods can sometimes be tricky and may require you to learn how to use them properly. It's also important to note that using cheats can take away from the challenge and enjoyment of the game.