IGN posted a little blurb about the most popular Pokemon seen in the VGC Regionals Top 16 in Seattle. Thought it deserved some mention around here, seeing how many ppl have wanted to see what the top teams were.
Looks like the top Pokemon across all age groups were Jellicent, Hydreigon, and Chandelure. I was surprised to see that Haxorus wasn't featured in as many Masters teams as he was in the Jrs and Srs. There's a LOT more defensive/strategy in the Masters choices, rather than the Jr/Sr that just like pounding things mercilessly.