my favorite part about this rumor is that it says the legendaries are a snake and a horse, meanwhile the other 95% of rumors say the legendaries are two wolves.
since this is the only post with even an ounce of credibility (guessing the names correctly), that means if you believe this one you have to dismiss 95% of the other ones, or the other way around and you dismiss the only "credible" rumor and give attention to the baseless bullshit 95%.
they're all fake as shit though, including this one. game freak has finally found a way to stop info from leaking this year around, and people are just going to have to accept it and be patient.