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In Pokemon Diamond\Pearl, you go to the Veilstone City Gym. In Pokemon Platinum, you go to the Hearthome City Gym.
beat the 7th gym leader and then go to mt cornet he wiill not be there
You go to the 8th Gym, which is in Sunyshore City. Not exactly you can't go there until after you've beaten or captured the legendary of the game depending Dialga>Diamond or Palkia>Pearl or Giratina> Platinum, that are on top of Mt. Coronet. Hope i helped!
go into oreburgh mine and talk to gym leader
Go to herthome and beat the gym master -Game master