>>37606353Does Ur-Devil have any real power in lore? I'd imagine that the Arceus and the Creation trio would make short work of it because of course they could, and below those four Mega Fug and the Primals could probably take it out as well since they're all celestial object-tier threats. Furthermore, Yveltal's Pokedex entries suggest that it could just let itself be killed to auto-wipe everything else around it if the Ur-Devil counts as a living thing.
Beyond godhax though I'm not sure what could take out Ur-Devil in a stand-up sit-down slobberknocker because it's hard to say just how strong it is relative to the Pokemon world. At least Kefka has some lore behind him to help place his power level in relation to other worlds, Ur-Devil is just there and you're expected to deal with it without knowing why it exists and what it can do.