EDIT: Its been claimed.
For Canada and US only. I have a spare and it expires on the 31st, so make sure to redeem it immediately if you get it. Note that it can only be redeemed on ORAS/XY, and only if you haven't already redeemed a Darkrai code on that specific game.
Just respond below saying you want it. First one to do so gets the code DM'd.
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Ye-- dammit.