First you want to start from the cave in Oreburgh and start to make your way up. The path is pretty easy at first and you should be able to make your way to the snowy peaks. However, when there, there is an obvious cave which you may have entered thinking that is the right way. It's not. continue along the path and you will go around a sort of hill (part of the mountain) and there will be another cave on the right. From here the rest of the path is very easy. I know this probably looks confusing and I'm sorry about that but just keep looking for a second cave when you're on top of the snow peaks. :)
level up a magneton in mt cornet
at the top of mt. cornet F*****s
he's in mt cornet
The path is the exact same as Diamond.
You have to go through Mt. Cornet a special way that will lead you up. It's very hard. When you get up, you will have to face team Galactic's boss; Cyrus. Now you have to catch/defeat Palkia when Cyrus summons him with the red chain that he crafted. When you do that there will be a mini cut scene.
Cyrus
go to the spear pillar
on the top of mt. cornet with cyrus.
you have to go to mt cornet and there is palkia and Cyrus
mt. cornet
you go to mt cornet
you find Cyrus in celestic town. you find Cyrus in celestic town
I think he goes straight to Mt Cornet.
you can find Cyrus at the top of mt cornet at spire pillar when you first appear out of the cave.
in mt cornet in mt cornet
you go to the oroburg entrince to mt cornet and use rck clime
its on the top of mt cornet.