I am deep into Pinwheel, and there are 4 rocks in a row. (they look like the ones you could push in Diamond/ Pearl) and I don't know what to do. Are they significant in any way?
When you catch Cobalion the other two legendaries will show up and that's where you will catch Virizon. You can get Cobalion on the third floor of Mistralton Cave and Terrakion is somewhere on Victory Road. They are the Legendary Trio in this game.