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I'm going with Plausible myself, which is why all the fan sites have it on their front page.
Why?
It's not someone faking a magazine scan with bad Japanese grammar.
It didn't come from DevianTART or 4Chan.
The first sources were on 2CH and the did not immediately link to a creation thread like with the Jynx evo fake. The Japanese go all out and make fake pokedex pages etc.
One of the pictures are of a bag. You can't just go and print up a giveaway bag without spending a lot of money. For it to be a fake, this person would had to have dropped a significant ammount of money (over $100 according to quick quotes) or waste company resources to do it.
In this case, It's not able to be completely disproved in 5 minutes like with all the other fakes so it actually has some weight to it. We aren't expecting any magazine scans this week and pretty much have to wait for Pokemon Sunday / The Nintendo Anouncement to see it.