Geodude is normally found in fields and mountains. People often mistake them for boulders, often stepping on, or tripping over them. In the world of Pokémon gyms and training, there are failures and then there are masters. Brock is a real master. Brock is the gym leader at the Pewter City Gym and uses his loyal Geodude and Onix for all his battles.
First appearence: Episode 5 — “Showdown in Pewter City”