Well it turns out this is just some monster from duel masters, i can't read japanese so it looks like for now this story is confirmed as fake.
"The new issue of coro coro magazine has revealed one new pokemon that will premier in the future pokemon movie. This is no surprise as Munchlax and ( Bonsly? ) were revealed before diamond and pearl came out. My question is, when will this end though? Aren't there enough new pokemon? Is another pokemon game just around the corner?"