It is possible that this is the creature listed as Roaring Moon in an expedition journal that still holds many mysteries.
Base Exp. 0
Height 2m
Weight 380kg
#1005 - Roaring-moon
Dark Dragon
Stats
HP 105 / 255
Attack 139 / 181
Defense 71 / 230
Sp. Atk. 55 / 173
Sp. Def. 101 / 230
Speed 119 / 200