Gengar. Somebody will probably try to get Gengar X so they can fit it in and blow everybody away with "their awesome skills" (more like cheap crap) before foreign cards are taken away. Unles AoA comes out here before Worlds. I forget when Worlds is....
I'd like to see a lone porygon z promo do well at worlds, but I'm not really sure how it matches up with all of the super fast decks like gengar and luxape. It does have a nice damage output, assuming you can protect your TM's.
It depends on the division. Sps don't do well in juniors, but win in masters. For seniors, I hope Inferay wins because its a great deck and is better than Mother Gengar.
Juniors: a well played Machamp deck, with something beside it, or a Flygon deck
Seniors: Gengar, Mother Gengar, or Legos
Masters: LuxApe, some kind of SP toolbox, or Legos
^
Yeah that guy's got it.
I mean one of those two will win, if not both.
Also a rogue possibility-Glaceon Lock, as long as dialga g doesn't appear and they play unown g.