You fight the first 2 team Galactic leaders with Sasuke and then you fight Galactic Boss Cyrus alone. If you beat him you get to face Dialga, you can either deafeat him or capture him.
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mt. coronet, peak 1, in the grass, need poke radar
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
You have to enter Mt. Coronet from the Hearthome City entrance (aka on the right side of the Mt ) and then go to the upper right hand corner. The rest of the way is pretty much set.
There is a map of Mt. Coronet in the Sinnoh region.
Mt coronet is only in diamond or pearl or platinum not in firered.