Pokémon FireRed/LeafGreen Guides:

Given the recent re-release of FireRed/LeafGreen on the Switch, these guides should provide accurate information in a convenient fashion.

Interactive Map!

Warning: Currently only complete up to Viridian Forest!

Click here to view the whole map of the game, see all hidden items and available Pokémon, and more!

ACE

Arbitrary Code Execution, or ACE for short, is doable on every version of Pokémon FireRed/LeafGreen using the mail glitch. Yes, even on the Switch. See Papa Jefe's video "FireRed and LeafGreen glitches are basically DLC" and the resources linked in its description for more details.

Note: The ACE codes may differ between languages, versions, and old emulators vs new emulators/real hardware. Please make sure you are using the correct codes, or you might break your game.