How do you change the Pokemon in press start FireRed?

You can change your Pokémon in FireRed by using the PC in any Pokémon Center:

1. Go to a Pokémon Center.

2. Talk to the nurse at the counter.

3. Select the "PC" option.

4. Select the "Change Pokémon" option.

5. Select the Pokémon you want to switch to.

6. Select the "Done" option.