The Fog Badge is a special achievement in the Pokémon video game series, specifically awarded to players who defeat the Cerulean City Gym Leader, Misty. This badge signifies that a trainer has successfully battled and overcome challenges in the Kanto region, particularly in water-type Pokémon battles. In addition to its symbolic value, the Fog Badge allows trainers to command higher-level Pokémon and grants the ability to use the move Surf outside of battle. Collecting badges like the Fog Badge is essential for trainers aiming to compete in the Pokémon League and become a Pokémon Champion.