Two events have been announced for North America from Nat Geo magazine advertisement.
The first event will take place over the internet where you can download Heracross or Pinser to your Pokemon X&Y games. This event will be available from August 13th to September 17th.
The second event will be done within Gamestop stores. You can receive a special serial code to download Heracronite or Pinserite. This event will be taking place from August 18th to August 31st.
No other details such as their abilities or attacks are known at this point.
Source: Serebii
