look around sinnoh then you'll see a big house but i cant explain what it looks like though
you find him
There in the gym in mossdeep city by the way the gym leader are actually gym leaders.
candace the leader of snowpoint gym is the 7th leader
you can find it in the ciann city pharmacy
after you beat the 4 gym leader in hearthome city
In Pokémon HeartGold, you can find the 3rd Gym Leader in Goldenrod City.
Eterna's gym leader can be found in the Eterna Gym After defeating the three trainers hiding in the trees inside the gym you can find the gym leader at the northern (upper) part of the gym.
Go to the lighthouse and the Gym leader should be there.
by winning a contest and by defeating the pastoria gym leader
The eighth gym leader is Claire in Blackthorn City
The fourth gym is located in Ecruteak City. You can find this city by progressing north from Goldenrod City. The gym is home to ghost type Pokemon. Its leader is the ghost-type leader, Morty.
The gym leader is Giovanni, leader of Team Rocket. You have to come back to Virdian last as he is the Eighth gym leader. THE LAST ONE!