Pokemon LeafGreen or FireRed - Brock is in Pewter City. Once you get through Viridian Forest, You will arrive in Pewter City. The Gym is in the West corner of the City.
Pokemon HeartGold or SoulSilver - You must get trough Digglet's Cave. Digglet's Cave will lead you to an area right under Pewter City. Head North and go through Viridian Forest. Once going through, you will arrive in Pewter City.
the first gym leader is brock.
The next gym leader is Misty in Cerulean city
Brock the rock gym leader
brock
Pewter City. Vs. The Rock-Type Gym Leader Brock
Brock is the first gym leader in pewter city.
brock is the 6th gymleader
It is the Pewter city gym Brock
you ask him to!
its brock
Brock.
You go to Pewter City and challenge Brock.