Idea: Christimas pokemon.

[Spiritmon]

Although I think Gararewl is a 'horse', not a 'girrafe', raindeer pokemon for Christmas is a good idea. I agree with 'a Christmas tree' pokemon too. Firstly, I was not sure Metalynx is good for it, but after looking into pokedex I did not find somebody who will be better.
Herolune as Santa Claus ... no words for it, it is so surprising/shocking and anexpected.

Christmas are relatited to gifts too, so I suggest a gift-looking pokemon . In my opinion it should be square (or another simple shape) and have some with-ribbon-looking design. Por exemple Comite, Cottonee (they are temporaly round and ball is simple shape) or Sylveon (has ribbons).
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Yeah, the XMas 2015 Fafurr looks like a tree. I have an impression shiny Fafurr is a spring version, regular is winter version .

There is truly many possibilities. And the part of Herolune Santa Claus...i know its very dumb and strange, but crazy ideas work very well in the past right? And for a Metalynx to be light a Christmas tree could help would be Ludicolo too. And A Cottonee gift would be interesting too to see.