Ambipom, definitely. I don't like how people call it the "new Tauros", though. It isn't anything like Tauros.
At first i thought Gliscor wasn't that much of an improvement to Gligar, and although i note its effectiveness, i'm still on the fence. I see no reason to use Gliscor over Skarmory as a physical wall.
Weavile and Azelf, too. I was under the impression that anything faster counters them, but they can actually take hits.
Oh, and i should mention that I just got swept by a Sash holding Yanmega in the Wifi Battle Tower. I was definitely impressed.
Not understanding all the Tangrowth love. I have yet to see one used effectively. There should really be an over-rated topic, because people tend to over-rate their favorites rather than under-rate.