The Fog Badge. obtained from Morty in Ecruteak City
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In Pokemon FireRed, the badge needed to surf is the Cascade Badge. This badge is obtained by defeating Misty, the Cerulean City Gym Leader. Once you have the Cascade Badge, you can use the move Surf outside of battle to navigate bodies of water and access new areas in the game.
You need the Fog Badge from Morty the Ecruteak Gym Leader in Ecruteak City before you can use Surf outside of battle.
In one of the gyms. I don't know witch one.
it's the badge from crasher wake
the badge you need is the 4th one and also if you have not already you can get surf in the dance theater.