252 Atk Adamant LO Flare Blitz Sheer Boosted Darmanitan vs 252 HP/252 Def Impish Hippowdon: 45.0% ~ 53.1% - 38% chance to 2HKO.
Alright, it's a decent check at least. But honestly, if the metagame can handle Victini they can probably handle Darmanitan.
Also, after that attack Darmanitan will...