The Rustboro Gym (Japanese: カナズミジム Kanazumi Gym) is the official Gym of Rustboro City. It is based on Pokémon. It is one of the eight official Gyms that form part of the Hoenn League. The Gym Leader is Roxanne. PKMN s who defeat her receive the Stone Badge. The Rustboro Gym is in the Generation III PKMN When defeated, Roxanne will give the player the Stone Badge as well as TM39 (Rock Tomb) as a reward.