It debuted in Showdown in Pewter City. How Brock obtained Geodude is unknown; however, Geodude has always been a vital member of Brock's team, always being there for battle or for certain contests. Geodude is an unfailingly fun-loving Pokémon that is known to have fun with Ash's Pikachu and the other Pokémon on many occasions, though it was seldom seen. When Brock left for Hoenn, he also left Geodude in his younger brother, Forrest's care.
When Brock returns to Pewter City in Grating Spaces!, Geodude along with Flint's Golem and both Brock's Steelix and Crobat to reunite with Brock. After Max reveals to them that Team Rocket's Meowth is stealing the Gym's Pokémon which Forrest recognizes it while it was lying that he hasn't stole anything. Forrest angrily releases Geodude to tackle Meowth on the ground revealing its motives of stealing. Brock was furious to see Team Rocket is responsible for remodelling the Gym where they pose as Gym remodellers calling them a disgrace while Forrest also became angered from their actions for stealing the Gym's Pokémon is was unforgivable challenging them to a fight. Geodude uses Sandstorm to keep them at bay while teaming up with Brock's Steelix by deflect both Aggron and Charizard's attacks which they are owned by Butch and Cassidy. Steelix hits Aggron with Iron Tail while Geodude hits Charizard's gut with Mega Punch. Team Rocket is soon blasted off by Ash's Pikachu and Donphan's Thunderbolt and Hyper Bean combination followed by Brock's Steelix's Dragon Breath and Geodude's Sandstorm. After the incident, Brock's family along with Brock's Pokémon waved goodbye to Ash and his group.
Brock later releases his Geodude to introduce an Alolan Geodude at Professor Oak's lab after meeting Ash and his five new Alolan friends in the Alola region. Later on, Geodude battles both Sophocles' Togedemaru and Lillie's Alolan Vulpix. When Togedemaru hits it with Zing Zap, it doesn't effect on it which Brock tells him that Kanto Geodude does not effect on electric attacks much to his dismay as he mistakes this as an Alolan type as Lillie let Snowy to use Powder Snow as Geodude disperses it with its newly learned Gyro Ball, surprising them both.
|Seismic Toss||Pokémon Fashion Flash|
|Tackle||Who Gets To Keep Togepi?|
|Mega Punch||Grating Spaces!|
|Gyro Ball +||When Regions Collide!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.