Question: where to find gardevoir mega stone in pokemon y?
Answer: Mega Gardevoir: In the Lumiose City southern boulevard cafe, you can trade for a Ralts. The Ralts holds this stone, Gardevoirite. Mega Mawile: You can find this stone, Mawilite, in Shabbneau Castle during the post-game. Mega Aggron: You can find this stone, Aggronite, in the Cyllage Gym during the post-game.