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Mega Flygon, Mega Jirachi, Mega Solrock, and Mega Lunatone have all been programmed into the game. All except Jirachi are scheduled to be officially revealed in the next two weeks. Depending on the demo code that one gets, they will receive the mega stone for Lunatone or Solrock. I will update if I manage to get any other information on these, or other pokemon. Whether or not you choose to believe me is of no concern to me because you will all know in the coming weeks that I was correct.