User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-3211692-20121205202132/@comment-3211692-20121206055410

I still disagree that it's anything but a Rathian. It was named that for a reason. It's incredibly unlikely that it's an Elder Dragon because it easily fits into the Flying Wyvern category and the ED categorization is specifically for monsters that don't fit in the other categories.

As for the Dragyuros (way easier to type than Doragyurosu), isn't there a version coming out that lives in the Tower? Or am I thinking of the Berkyuros?

Regardless, considering how wide-ranging its habitat already is, I wouldn't be too surprised if the Black Rathian managed to encounter Dragyuros at least in passing here and there. It's likely that it already evolved the defense-down gas, extra spike, and advanced flame sac beforehand and just made do with mimicing other monster's techniques.