http://www.gamestop.com/nintendo-3ds/games/pokemon-omega-ruby/114994
Mega Stone to Mega Evolve Heracross or Pinsir

Receive Heracross for Pokémon X or Pinsir for Pokémon Y Online Starting August 13th through September 17th!
Then Visit your Local GameStop from August 18th through September 21st and Receive a Free Code for a Mega Stone to Mega Evolve Heracross or Pinsir!

*While Supplies Last, Contact Local Store for more Information. Code will be distributed on a physical card with download instructions.