In what is possibly National Geographic Kids magazine, two event distributions have been announced for the US. Serial codes for Pinsirite and Heracronite will be available at participating GameStop stores from Aug. 18 until Aug. 31, while supplies last. Heracross and Pinsir will be distributed via Mystery Gift from Aug. 13 until Sept. 17.
Each code will be random and different for each Mega Stone. They will be available until supplies last.