How catch mew in fire red gba?

To catch Mew in Pokémon FireRed, you'll need to use a glitch, as Mew is not normally available in the game. First, you must go to Cerulean City and navigate to the area near the bridge where the Youngster is standing. By performing specific actions involving the Youngster and the trainer in the grass, you can manipulate the game's code to encounter Mew. Remember to save your game before attempting the glitch to avoid losing progress.