Just to finish this up, I'm going to list, off the top of my head, some very obvious counters to Reuniclus, regardless of set, that can at least force it out and gain some momentum and SR damage:
- Fast Taunters (Whimsicott, Gliscor, Aerodactyl and Deoxys come to mind)
- Tyranitar/Scizor/Lati@s (as mentioned earlier, depends on the opposing set)
- Spiritomb
- SpDefensive healers (Vaporeon/Jellicent were mentioned?)
- HaxRachi (if nothing else, stops it coming in w/o TR already in place)
- Pursuit
- Mold Breaker/something to change its ability
Slight nitpicking here.
Firstly yes, Taunt shuts down Reuniclus however I doubt Reuniclus will dare set up on a Taunt user not to mention all of the taunters mentioned are somewhat risky switch-ins.
-Tyranitar/Scizor/Latias. Yeah ill give you these and they are the traditional counters to Reuniclus. CM + Roar Latias loses to Last poke Reuniclus though and it also has to watch out for Psyshock Varients. Tyranitar also has to watch out for Focus Blast which does a shitload and its not exactually hard to predict a T-Tar switch in (especialy if its your opponents only Reuniclus check)
-Spiritomb. Yeah o.k it walls it on the other hand as someone who has actually used Spiritomb as a Reuniclus check in the past it has limited use in the metagame. Especially since if you are using Spiritomb its probs on stall and therefore used for spinblocking making it slightly easier to wear down.
-SDef healers yep fine although I don't see what the hell Vaporeon does to Reuniclus bar Roar in which case Reuniclus sweeps as a last poke
HaxRachi- Yep thats fine
Pursuit- I disagree with this being a counter. To start with, only Scizor and T-Tar can dare Pursuit Reuniclus. In addition, both take a fair bit from Focus Blast, AND Reuniclus can actually survive Pursuits with ease if it stays in. For example I brought in my CB Tyranitar in on Reuniclus, got owned by Focus Blast, Pursuited which it promptly survived and killed it off with a second Focus Blast. So no I don't really consider it a "counter".
-Mold Breaker, So what...Haxorus which dies upon switching in? Also ffs if we go around suggesting shitty moves like Gastro Acid to deal with Reuniclus then it just goes to show how much people are grasping at straws to check it.
Also regarding your "team" (with the top 3 Reuniclus counters -_-) 2 of those are beaten by TR Reuniclus so that just leaves Scizor stopping it from sweeping. Also something to remember is that I can go out and build a Reuniclus proof team in a few minutes. However it might also need to check things such as Excadrill or Scraggly or something.
Perhaps the most frustrating thing is that with a pokemon or too in support its exstremely easy for it to sweep. For example Mew, Deoxys D, Lati@s all check Reuniclus but all can be lured out and then nailed by a CB Tyranitar or something. Maybe im straying a little close to the "predicting prediction" or X sweeps if Y takes out Z but not if G removes D" arguments but Reuniclus is a very frustrating pokemon to deal with.