Definitely Scrafty. He has bulk to set up a few DDs, then get stronger after every kill. DNite is better off running a quite crippling Parashuffling set of Sub/T-Wave/Roost/Dragon Tail. If Mence runs Moxie, he's too frail. I use Scrafty as a late-game cleaner on my Hail team.
And Sakuma, there is a select few things that can kill Dragonite through Multiscale, like Excadrill's Adamant max Attack +2 LO Rock Slide.