After you go to Sky Tower and defeat Rayquaza you go to Whiscash and then you'll see one of the Square's Pokemon evolved. So now if you're on the correct level to be able to evolve you go to the Luminous Cave and remember you have to be alone with no one in your team.
couldn't have put it better myself(except luminous cave is north from the Square).
there's not too many Mystery Dungeon fans on this board, are there??
Go look at the other Pokemon game boards. >_>
does pokemon evolve in this game
There is a post game and a pre game
Get past the pre game and evelution is yours
(You Face Rayquaza to destroy a meteor)
Buy the book at Wally World
get the Nintendo Power Version because Primea's Has Misprints and False Stuff!!