its in azalea town
there is no 9th gym
You CAN NOT become a Gym Leader in Pokemon HeartGold and SoulSilver or ANY MAIN SERIES POKEMON GAME.
Talk 2 blue at cinnabar island then go 2 the Viridian city gym.
walk in
The gym is in Blackthorn City.The gym leader is Clair.
you can not get Growdon on heartgold but Ruby and the 2 games that go with it you get at a cave in the city that has the 8th gym leder
He has many types.
In Pokémon HeartGold, you can find the 3rd Gym Leader in Goldenrod City.
awww by beating the 7th gym
try beating the gym leader
Obtain it from a gym leader.
mahogany town