A battle arena inspired by the Pewter City Gym from the Pokémon series, featuring a rugged, rocky terrain with jagged stone formations and a dusty, earth-toned floor. Large boulders of various sizes are scattered across the ground, creating a natural battlefield. In the background, gray stone walls with subtle cracks and moss patches give the gym a cave-like, ancient feel. Soft, ambient light filters through an opening above, casting dramatic shadows on the rocks. A large, flat stone platform is