Mossdeep Gym is a Pokémon Gym located in the Hoenn region, specifically in the city of Mossdeep City. It is known for its unique design, featuring a space-themed interior that reflects the city's connection to space exploration. The Gym specializes in Psychic-type Pokémon, making it a challenging destination for trainers seeking to earn the Mind Badge. The Gym Leaders are Tate and Liza, who are twin siblings that work together in battles. Trainers must navigate a series of puzzles and battles against other trainers before facing the Gym Leaders. Successfully defeating them grants the trainer the Mind Badge, which is essential for progressing in the Hoenn Pokémon League.