You get to the summit by going inside Mt. Coronet, Then you keep heading up until you see a bunch of those bad guys, then defeat them all while still going up. You should finally see a open area with Diagla/Palkia and the master of the bad guys. You will also see the professer, Dawn/other guy, and then you will battle the bad guys master, and defeat him, then you will use ...
Mt. Coronet (middle) peak
no
the east of hearthome
Up of Oreburgh city
i smell bad
in the top of mtcoronet
Shoot him sorry for the language
theres no such thing
First you need the Mystery gift. Once u have that go to the arceus event to get the azure flute. Then, go to mtcoronet. Go to where you caught dialga or palkia and there should be stairs there. :)
riley is on the island in canalave
go in by Hearthome city
You have to as it is a main part of the storyline.