SPOILERS! Update: Chart of Mostly All New Pokemon in X/Y Leak Thread (Enter at Your Own Risk!)

[tbone51]

Lelouch_Vi_Brittania said:

tbone51 said:

Lelouch_Vi_Brittania said:
Ok, now I want that aggron, anyone know how to find his megastone?

no but i do kno aron + larvitar are exclusives in both games and their mega stones are in the opposite in the game they appear in

Ok, I'll be getting Y, looks like I'll have to trade with someone.

i think, the mega stone is in Y (aggron) so all you need to do is trade!