try beating the gym leader
ponie
you cant get to sinnoh in heart gold, but you can find the gym leaders from sinnoh.
Unfortunatly you cant, this feature in heartgold/ soulsilver was epic!
beat chuck in cinnawood city gym have psychic,flying and electric types
there is no 9th gym
You CAN NOT become a Gym Leader in Pokemon HeartGold and SoulSilver or ANY MAIN SERIES POKEMON GAME.
walk in
The gym is in Blackthorn City.The gym leader is Clair.
He has many types.
In Pokémon HeartGold, you can find the 3rd Gym Leader in Goldenrod City.
awww by beating the 7th gym
its in azalea town