Kane Bugeja of SnapThirty writes:
Let’s face it, if you’ve been keeping up to date with the surge of Mega Evolutions, you’ve already heard of Mega Diancie. Well, now the prismatic princess has received an official promo showcasing it’s new form, along with how to get it. As of now, Diancie can only be obtained in Pokemon X and Y, through an upcoming event (the details of which are different for each country). Although North America, Canada and Mexico can grab Diancie from now up until November 16th, whilst Australia and New Zealand Trainers can nab this rare gem from November 10th until the 28th.