It's not that far in. Go in from the Oreburg entrance, then head towards the Rock Smashable rocks going south, then turning right. Go up the stairs that are beneath you, before the rocks, then surf across the water. You'll find your dawn stone.
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In Pokemon Diamond, Dawn Stone can be found on Route 225 and on Mount Coronet. It will help Kiralia and Snorunt evolve.
mt coronet, near the bottom of the cave, you will need surf to get it signed:hartm017
You can get a Dawn Stone at Mt. Coronet Floor 1 by using surf, you could also get one at route 225 or by using the pickup ability.
There is no other place to get it besides Mount. Coronet. Sorry
in mount coronet