How do you get to the 8th gym in HeartGold?

Answer 1

to get to the 8th gym, you have o have done the radio tower and gotten all other gym badges.

*note* if you listened to the last guy who answered this, he was being a jerk. resetting your game would delete all of your data and you would have to start all over again.

After you have gotten all other badges, defeated Team Rocket in the Radio Tower and in the underground in Goldenrod City go back to mahogany town.

Trek through route 42 to the east of mahogany town

go through the maze of the freezing cold ice path

watch were you slide, pick up some items, including the HM Waterfall

find your way to Blackthorn City where there will be a woman who will give Pokemon the Effort Ribbon, if she thinks they are hard workers

You will find a house with the Move Deleter, and 3 Move Tutors,

as well as

the 8th Gym of the Johto Region

even after you beat Clair, she will not give you the badge, until you answer some questions given by her grandfather in the Dragon Den.

after she gives you a TM,

return to see the Dragon Master, and he will give you a Dratini.

If you answer every one of his questions correctly, it might even know the move,

Extremespeed