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I'm not skeptic about this being fake for once. That'd be a lot of doctoring for someone to do - and if they did such, I'd think we'd pick up more telltale signs than Hikozaru's eye color. And it'd require doing what appears to be a new picture of Dialga - have we ever seen it twist its head around and roar like that?
If this is a fake, someone's got way too much time and talent on their hands. I'm going to say this is real.