Volcarona was meant to be a smaller legendary, called pseudo legendaries with Metagross, Dragonite and Hydreigon but this is unproved as all Pseudo-Legendaries have a base stat total of 600 and a 3 evolution line. So, basically Volcarona is a pseudo-pseudo-legendary that reks with 135 Sp.Atk. As likely as it seems, Volcarona isn't a legendary, nor a pseudo one, but is on the same as all the psychic 100 stats and manaphy.
But no tail glow. D: