The gym leader of Pewter City, Brock uses Rock type Pokémon. Graveler will use Defense Curl to increase its Defense stat and Rollout to repeat for 5 turns with each hit increasing power every turn. Rhyhorn will use Scary Face to sharply lower the target’s Speed stat and Horn Drill to bring the target down with one hit. Omastar will use Ancientpower for a 10% chance of increasing all of its stats and Brine to deal double damage on targets with half their HP left. Kabutops will use Aqua Jet to strike first and Giga Drain to restore its HP by half the damage its target took. Onix will use Sandstorm to change the weather for 5 turns and Screech to sharply lower the target’s Defense stat. After the battle, you’ll receive the Boulder Badge and a TM80 (Rock Slide). Rock Slide has a 30% chance of making the target flinch. ... https://www.youtube.com/watch?v=wS0B7RLn0oQ

After getting the Soul Badge, you have the option to Surf southwest from Fuchsia City to a place called Seafoam Islands. If you see boulders, use Strength to push them through the holes so the water currents stop moving you around randomly. Once you push the boulders into the water, use Surf and you’ll see the legendary bird Pokémon, Articuno. Save your game before you interact with it. Articuno is on Level 50. A legendary Pokémon won’t be easy to catch. Use status problem moves, like sleeping then hurl out some Ultra Balls. ... https://www.youtube.com/watch?v=6jMiJd9Z_Y0