Where is flash in pokemon firered?

Flash is not a Pokémon in Pokémon FireRed. It's a HM (Hidden Machine) that you learn from Professor Oak at the Pokémon Lab in Pallet Town.

Here's how you get Flash:

1. Complete the first gym and defeat Brock.

2. Return to Pallet Town and speak to Professor Oak.

3. He will teach you the HM Flash.

Flash allows you to light up dark areas like caves and tunnels, making it easier to see. It's a valuable tool for navigating certain areas of the game.