LolChandelure
Anyways, as the topic in question is Shadow Tag Chandera, the possiblity of other abilities will be dismissed in this post.
Well, first of all, one thing. Chandelure is incredibly simple. Come in, KO, switch out. ANY assumptions that the fact that you can bring in a Pokemon to resist its chosen move after it gets a kill, and thus it is not Uber worthy, is incredibly silly. The point is, Chandlure can repeatedly switch in, kill certain Pokemon, and you can't do anything about it. The number of Pokemon that can truly kill it reliably are incredibly slim. Pursuit users, Dugtrio, and uhhh. That's it, really. The fact of the matter is, a Chandelure user has 5 other Pokemon. You can't expect them to just sacrifice Chandelure with the logic that "oh it killed something, it has done its job thus I can let it die". The sole reason it should even be considered for Ubers, is that it [i]doesn't[/i] just kill one Pokemon, it kills, switches out, and kills more later. That's the entire point, what can you do to prevent this? Well, hazards play quite the role. Being a Fire type, Chandelure will take a whopping 25% upon entry if Stealth Rock is up. Spikes, Toxic, Sandstorm, etc. can further weather it down. But, you [i]can't[/i] expect to have hazards up consistently. The fact of the matter is, what can you do about it? Pursuit Tyranitar is undoubtedly a superb option for killing it, but I wholly understand some people just don't want to use certain Pokemon for the sake of one Pokemon. So, what warrants banning? Overcentralization. If the majority of teams need to build accordingly for the sake of one particular Pokemon, then that's a clear signal for banning. Course, there's the problem with banning, we're [i]humans[/i]. No matter the result, there will be those who agree and those who disagree. It's simply [i]impossible[/i] to satisfy both groups. So we can only decide to the best of our judgment, because there is no "correct" answer. Anyways, back to my argument. Well, what defines overcentralization? It's fairly obvious that my example of the majority of teams adding counters is quite the exxageration; if such was true, we wouldn't be having such a discussion. Looking at the Reborn usage staistics, Chandelure is #9 in usage. But does that tell us anything? No. Reborn statistics hardly define the literal metagame of Reborn, the fact is Unrated battles simply would be more accurate. That's the reason Smogon statistics work, the ladder [i]is[/i] the metagame. But here, it's anything but. So what am i trying to say? Well, I'm solidifying my argument that you [i]can't[/i] be sure, ever. As mentioned prior, there is no correct decision. You [i]can't[/i] see if there's truly overcentralization to push for a ban, Reborn tiers are pretty much theorymon I'll admit. With that said, I'll be neutral for the time being.