With skill, luck and knowledge. Alternately, you can use a walkthrough.
You have to have stradegey.
Search it on youtube
pass the missions
you can ride the magnet train
You can't
Defeat the Mahagony Gym.
There is no best Pokemon on Pokemon HeartGold.
you have to take the stairs all the way to her instead of the elevator
Goldenrod City or Lavender Town after fixing the Power Plant.
there is no Pokemon Mansion in Heartgold.
They are not in Pokemon HeartGold
you must be talkin about Pokemon soulSilver or heartGold. no there is not a pass to go to hoenn. hoenn is not in the game. sorry -RR14