Use the big platinum book to help you find your way through Mt. Coronet
go to mt cornet and battle dialga or palkia or girtina depends if you have diamond pear or platinum
When you get to the ruins
He's not blocking the way. The boss is in Spear Pillar at the top of Mt. Cornet.
Just go to their Warehouse in Velistone city, and search for their boss (Its somewhere IN the base of the warehouse..) and Defaeat them, and they are off to Mt. Cornet.
Palmer is the final boss....... but it depends in where you started at........
pass mt cornet to the top of the mountain where there is mesperit, azelf, uxie, and plkia
the 1st time u go through mt cornet u meet him
you can find Cyrus at the top of mt cornet at spire pillar when you first appear out of the cave.
you need to fight the glactic boss at their h/q then go to spear pillar [mt cornet] and fight him again
Cyrus is the team galactic boss and the player encounters him in many location during the course of the game. The final confrontation with Cyrus in Diamond and Pearl is at the top of Mt. Cornet when he tries to summon Dialga and Palkia.
from the oreburg or hearthhome city side but is't a beautiful place once you get to the snowy part have fun.
defeat team galactic boss and he will give you 1master ball