Cerulean Gym is a popular location in the Pokémon series, known for its water-themed battles. It is located in Cerulean City and is run by Misty, a skilled Water-type Pokémon Trainer. The gym features a unique design with pools and aquatic elements, making it visually appealing to visitors. Trainers who challenge Cerulean Gym must defeat Misty to earn the Cascade Badge. This badge allows Pokémon to use the move Surf outside of battle. The gym is a favorite among fans for its connection to the original Pokémon games and the animated series.