Darmanitan is only listed as Regenerator, but it has a lot of potential as unaware (it resists all contrary moves except draco meteor, that's why i always put Darm with Xern) or as PH to check status + No Guard users (Gira can do that as well, but is weak to any No Guard that uses Blizzard).
Xerneas should have Magic Bounce listed, put a Subs on this thing and D-Tail can't phaze, Circle Throw is resisted, only Mold WW works. Then setup Tail Glow or something behind a Subs and be happy.
I use Close Combat/Judgment/King Shield/Shell Smash Aegiglash with Stance Change. It's not powerful as a M-Gengar (except a Close Combat coming from 150 atk compared to a Secret Sword coming from a 170 SpAtk, but i'm not absolutely sure of it, need to see the calcs), can't kill Sturdinjas without Mold, but you can deal Sheddy with SR, and more important: This guy resists all -ate priority moves, while Gengar easily dies for them (well, not Pixilate) after SS.
Now going into a really gimmick thing: -ate Shedinja. All of -ate abilities are better versions of Scrappy. You hit the ghosts, get some coverage, and get a 1.3 boost on ExtremeSpeed to finish your target after the Leftovers (or Poison Heal) recovery that comes after you hit them with Endeavor.