From February 1st to February 24th in America (not sure about other countries) you can get a code from GameStop for a mew
Ok UK you have it till the 28th
http://www.serebii.net/events/2016.shtml
Link for all events this year that are known so far
It's for alpha sapphire/omega ruby or x/y
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I know what I'm doing after work hue hue hue