For those that missed the codes as the came out, here is a brief summary of all the codes and what mega stones you get with them. More will be added as they are released. DRACHE Ampharos, Altaria, Latios, Latias. POYONG Gardevoir, Gallade, Lopunny, and Diancie SABLEVOLANT Manectric, Agrron, Tyranitar, and Abomasnow. MATSUBUSA Hoenn Starters, Camerupt, Banette AZUL Pidgeot, Steelix, Houndoom, Heracross INTIMIDATE Beedrill, Audino, Mawile, Medicham M2DESCENT Mewtwo X and Mewtwo Y UPDATE: all codes are said to stop working on the 31st of October according to Serebii. Please get them when you can!
So that means the last Mega Stone Code will be the remaining Legendaries.... Though I'm glad Mega Aggron finally came out because its my Fav. Mega
A new code was added to the index. POYONG that gives you the stones for Gardevoir, Gallade, Diancie, and Lopunny