User blog comment:Mckrongs/Monster Variations/@comment-11685710-20130916155504

McKrongs I don't think Shagaru is a subspecies...not really.

He's "just" an adult Goa, so I'd say it's similar to Rusted Daora although he got some new moves and has some features, that Goa doesn't have like the Eyes and the "real" Horns.