Sig'd. In any case, this is pure speculation, but I think some variant of Vileplume and Scizor Prime will be insanely broken. If not that, we could see Vileplume/Machamp, Vileplume/Sableye/Something else, or the like. Vileplume is just too beastly. I don't think people see it's full potential. Scenario:
Vileplume: Candy into Vileplume
Vileplume: Drop Uxie
Sablelock; Power Spray
Vileplume: No
Vileplume: *points to Vileplume*
Scenario:
Vileplume: Candy into Vileplume
Vileplume: Pass
Sablelock: Flash Bite
Sablelock: Poké Turn
Vileplume: No
Vileplume: *points to Vileplume*
Scenario:
Vileplume: Candy into Vileplume
Vileplume: Pass
Gyarados: Expert Belt
Vileplume: No
Vileplume: *points to Vileplume*
Vileplume is like Spiritomb, but better. Infinitely better in certain situations. It's just too good, and there are very few reliable counters to it. Dialga G Lv.X pwns any deck like that, but then you have to look at comboing Vileplume with other stuff to deal with DGX. There are so many scenarios in which locking trainers shuts your opponent down.
Look at Spiritomb. CurseGar has to shuffle around just to keep the trainer lock on, and CurseGar was a tier one or two deck because it locked trainers between attacks. Spiritomb has advantages that Vileplume doesn't, but this card will really be a major threat to any deck in the format that utilizes trainers heavily, which we will be seeing a lot more of due to Claydol's rotation.