Enter Mt. Coronet from the Oreburgh City side, and as soon as you enter go immediately north. When you go as far north as you can, there is water to the right. Surf across, and follow the walkable space until you can use Rock Climb. Go up the stairs, and follow the rest of the mountain until you get outside into the snow. Head east, and use Rock Climb once. After that, head west, then south through the grass along the raised path. Follow it along the U-turn, and enter the cave. Follow the cave until you come out into the snow again. Walk east, then north and go down the stairs into the trench. Rock Climb at the end of the trench on the west wall, then head down the first stairs. Go west as far as possible, and you should be at another cave. Enter the cave, follow the path and battle your way through the Galactic Grunts, and you should find yourself at Spear Pillar.
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You have to go to the top of mt conoret, where you'll have a battle with your rival against commander Mars and Jupiter. After that you'll go to the distortion world where you have to beat Cyrus and fight Gratina. Once all that is completed, team Galactic will be gone from mt Coronet. To find Cyrus and the top of mt Coronet: http://www.mahalo.com/Pokemon-platinum-walkthrough-part-6/
Defeat Team Galactic on Mt. Coronet.
defeat team galactic on mt. coronet
Well I forgot what to do spacificly but I think you have to defeat the elete 4
enter mt. coronet from the hearthome side and use rock climb to get into another part of mt. coronet but if you haven't beaten Cyrus in veilstone city team galactic HQ then there will be a picture on the wall blocking the maze up mt. coronet the rest is up to you hope this helped