@Shiramu: To reiterate what Manhattan said, just because Serebii posted it, doesn't make it real. Remember that supposed CoroCoro scan that had Victini in it? That came from the same place that these pictures came from, the only difference is Serebii and WPM have sources that claim it to be real. But really, how can you tell these sources are credible? Just because they were able to describe the pokemon showed in the pokemon musical thing, the one that was completely obscured by pokemon musical items? For all we know, that guy could've just described anything, since the poke was covered up too much to tell. And it's not hard to fake in-game things nowadays. Remember that green owl-plant thing?
So basically, it's too soon to know if it's real. There's actually more evidence of it being fake than it being real, so you shouldn't be so quick to get mad when we claim it to be fake.
And to the 'pokes resembling other pokes thing', those pokemon don't resemble past pokes so much that they even share body parts with them, such as Pignit2 and Lickilicky.