Top of Mt Coronet? It's all in what he's said.
He's in the Galactic Veilstone Building, and on top of Mt. Coronet. But not after he leaves Mt. Coronet.
you can get one from Cyrus when you first go to Mt. Coronet
Pokemon is lame..
hes right in front of palkia
At the peak of Mt. Coronet.
Cyrus and Jupiter the other two are in the mnt.
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/
After releasing the three Pokemon of the lakes, Cyrus goes to the top of Mt. Coronet
yes your rival will heal your Pokemon before you fight Cyrus.
Yes you can. You fight him right before you fight Dialga at the top of Mt. Coronet.
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