It has been confirmed through an advert in Nat Geo magazine that two special events are coming to North America. These events are based on Mega Evolutions. First, from August 13th to September 17th, you will be able to download Heracross or Pinsir to your X & Y games over the Internet. In addition to that, if you go to Gamestop stores from August 18th to August 31st, you'll be able to receive a special serial code to download the Heracronite or Pinsirite Mega Stones. We'll provide full details on this event as it comes, including if it is in other regions.
Edit @ 16:02: Heracross comes at Level 50 with the moves Bullet Seed, Pin Missile, Close Combat, and Megahorn and will download to Pokémon X while Pinsir also comes at Level 50 with the moves X-Scissor, Earthquake, Stone Edge, and Return and will download to Pokémon Y. Their abilities are random and they both have a set nature of Adamant. The Mega Stone event sends Heracronite to Pokémon X and Pinsirite to Pokémon Y.
http://www.serebii.net/index2.shtml
