Yeah, I'm not a big fan of the Dark/Dragon type! Mainly because of the weaknesses it has as godzilla41 pointed out! So I'm hoping that Ononokusu has just as good stats as the Hydra dragon! I already have my sights on that Dark/Fighting type anyways so I won't need another Dark type!
ALSO: Has anyone noticed that the Grass/Steel type is gonna be one of the best pokemon in terms of resistances! (Poison has no effect! Normal, Grass, Water, Electric, Psychic, Rock, Ghost, Dragon, Dark and Steel are not very effective! That's crazy!)