Pewter City
Go to Blackthorn city. The gym is there
go to the next gym leader.
The Mahogany City gym leader is not in Cianwood. He is in the gym in Mahogany, not anywhere else.
The third Gym Leader in Pokémon HeartGold who is Whitney the Goldenrod City Gym Leader, she'll be in the Radio Tower when you arrive in the city. You have to get the Radio Card for the PokéGear before you can battle her.
Pewter City
The Pewter City gym is a Rock-type gym. The gym leader is Brock, who gives the Boulder Badge when defeated.
brock
Pewter City. Vs. The Rock-Type Gym Leader Brock
Brock is the first gym leader in pewter city.
After defeating the champion in heartgold and going through diglett's cave
The 9th gym leader is Brock and he is in pewter city.To go there yoU hVae to pasS snorlax that is coverinG the entrace to the cave.
It is the Pewter city gym Brock
In Pokémon HeartGold, you can find the 3rd Gym Leader in Goldenrod City.
Gym Leader Blue
He is the Pewter City gym leader.
Pewter City.