Mossdeep City Gym is a Pokémon Gym located in the Hoenn region, known for its unique focus on Psychic-type Pokémon. The Gym is run by the twin brothers, Tate and Liza, who specialize in double battles, requiring trainers to use two Pokémon at once. The Gym's design features a space-themed aesthetic, reflecting the city's connection to the Space Center nearby. To earn the Mind Badge, challengers must defeat Tate and Liza in battle. The Gym is known for its challenging puzzles and the need for strategic teamwork, making it a memorable stop for trainers on their journey through Hoenn.