The format NEEDS to be HGSS-on. If Spiritomb is allowed to be in the format, then trainer lock becomes the best deck out there, whether in the form of Vileplume, or Gothitelle. Quite frankly, I don't want to see trainer lock be THAT unbalanced. Sure, Luxray GL LV. X might be around, but, it'll be much harder to actually get out next format. And, if facing Gothitelle, all they have to do is Gust of Wind it up and wreck it. If facing Vileplume, it's a little more viable, but it also comes down to what they're playing alongside it. Further, why force decks to HAVE to play Luxray GL LV. X for that one purpose?
If we go HGSS-on, the only threatening part to trainer lock, at least imo, is Gothitelle. Vileplume won't be as effective, since it'll be hard to get to really make it efficient. Gothitelle won't be as worrisome, as there will be plenty of things that should be faster than it, all of which will make use of Gust of Wind (I refuse to call it catcher).
HGSS-on or bust, imo.