After retrieving a special medicine for Olivine Lighthouse's Ampharos, you reach Cianwood City. After defeating Morty for the Fog Badge, your fifth Pokémon Gym is in sight. The Gym Leader is Chuck, a Pokémon Trainer that specializes in Fighting-Type Pokémon. You make it through the Gym Puzzle, climbing rocks and waterfalls, and are face-to-face with the Gym Leader.