Role Within the Game

Brock is the first Gym Leader in the game, found in Pewter City. He trains Rock-type Pokemon, and gives out theBoulder badge and TM34 Bide (Generation I), TM39 Rock Tomb (Generation III) or TM80 Rock Slide (Generation IV) when defeated.

Pokemon

Red and Blue versions

Geodude Lv. 12	Onix Lv. 14

Yellow version

Geodude Lv. 10	Onix Lv. 12

Gold, Silver and Crystal versions

♂ Graveler Lv. 41	♂ Rhyhorn Lv. 41	♂ Omastar Lv. 42	♂ Kabutops Lv. 42	♂ Onix Lv. 44

FireRed and LeafGreen versions

♂ Geodude Lv. 12	♂ Onix Lv. 14

HeartGold and SoulSilver versions

♂ Graveler Lv. 51	♂ Rhyhorn Lv. 51	♂ Omastar Lv. 53	♂ Kabutops Lv. 52	♂ Onix Lv. 54

Rematch

♂ Golem Lv. 55	♂ Relicanth Lv. 54	♂ Omastar Lv. 56	♂ Kabutops Lv. 55	♂ Rampardos Lv. 57	♂ Onix Lv. 61

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Kanto Gym Leaders
Brock	Misty	Lt. Surge	Erika	Koga	Sabrina	Blaine	Giovanni
Pewter City Gym	Cerulean City Gym	Vermilion City Gym	Celadon City Gym	Fuchsia City Gym	Saffron City Gym	Cinnabar Island Gym	Viridian City Gym
Boulder Badge	Cascade Badge	Thunder Badge	Rainbow Badge	Soul Badge	Marsh Badge	Volcano Badge	Earth Badge