In theory, of course. Not enough Pokemon are running Taunt in this metagame at all, let alone anything fast enough to actually do it for that to be a serious deterrent. And if Deo-D starts becoming popular, I'm curious as to how many of the Pokemon that even learn Taunt can find any space for it on their moveset.
Yeah, that's the thing in hindsight: There's quite a few good users, like Hydreigon, Gliscor, Gyarados, Tyranitar, etc, but how many of them can afford to invest a moveslot for that this generation?
If we are going to talk bans, lets talk bans. But, dont bring up a no-brainer.
Okay, so tell me, what's a "no-brainer"? That your "opinion" that Reuniclus should be banned is the only correct one? Just no. Fuck no. How dare I have a differing opinion on the matter! How dare I think that Reuniclus isn't broken, just powerful! Another note, read an entire argument before you comment. Just ignoring the entire thing just because of one thing you patently disagree with is the fastest way to piss me off.
By the way, I used a specially defensive Drapion back in Generation IV and actually hit 1450+ ladder ranking using it, so it's not that bad, if not a bit outclassed, but then again, this is a different generation with Garchomps and such running around, so I haven't bothered to run it since.
Thing is, Reuniclus really suffers from the likes of Jirachi, Metagross, Trick users, etc. Jirachi and Metagross can muscle their way through the psychic fetus by virtue of their bulk, Psychic resist, and either hard-hitting STAB or paraflinch abuse, TR nonwithstanding. Trick shuts it down by making it completely useless. Hell, if you're feeling ballsy, use Gastro Acid to get rid of Magic Guard. Or even Unaware Quagsire with some special bulk. Besides, I know what the hell I'm talking about. I was in the top 100 on the smogon server a bit ago but dropped off due to unforseen circumstances.