You need to be able to use Rock Climb first (Rock Climb from South East entrance from Hearthome)
If you're playing Diamond, the Pokemon in Mt. Coronet should be Dialga. You have to get the 7th badge before you are able to get to the top of Mt. Coronet where Dialga is though.
On top of Mt. Coronet.
on top of mount coronet
it is located at the top of mount coronet.
Its at the top of mount coronet
go to the top of mt coronet
He's in the Galactic Veilstone Building, and on top of Mt. Coronet. But not after he leaves Mt. Coronet.
Tangela is a swarming Pokemon you can only get it on certain days. You can swarm it at the top of Mt. Coronet.
The seventh gym is located in Snowpoint City at the very top of the map. You need to get through Mount Coronet and 2 snow routes to get there.
You Have to go to mt coronet and you have to go to the top of it and battle/catch palkia/dialga and then the guy wont be blocking the way no more hope this helps
If you mean Dialga, then it's at the top of Mount Coronet at Spear Pillar.
in spear pillar.(spear pillar is at the top of mount coronet)