This is an artist's recreation of a long extinct Pokemon, using the colors depicted in Paleolithic artwork known as 'The Fanged Devil' It's a long extinct relative of Pyroar, Incineroar, Luxray, etc.-- but from a different, long gone Family. Typing and Abilities are unknown.
A Tale of Three Kitties - A personal, for-fun theory that Raikou, Entei, and Suicune are a Jurassic Park-like resurrection of extinct cat Pokemon. And they are most definitely cats. "Legendary Dog" believers can cry about it.
Dimorphism in the Lati species, followed by super rare Androgynous(Mega Colored?) and Gynandromorph specimens The chicks are neutrally colored at birth and will grow into their adult plumage with time. Some have speculated these Pokemon share distant ancestry with Togekiss.
Dracodon - Dragon/Ground Type An ancient Pokemon that's fairly related to Krookodile and Feraligatr, during a time where their ancestors took so many different forms apart from Semi-Aquatic. This one in particular was large, terrestrial, and could stand on its hind legs (barely.)