Kingdra

It seems that Kingdra has been given all the tools it needs in order to thrive in the VGC 2012 metagame. An ability in Swift Swim that boosts its Speed in rain, a great Water- and Dragon-typing, a reliable spread move in Surf that’s further boosted by the rain and reasonable bulk all allow Kingdra to be an effective teammate in this weather-dominated metagame. However, Kingdra lives and dies with Rain Dance on the field, so it is essential that you use Politoed to set up rain, and allow it to survive as long as possible in order to replenish the rain that will inevitably be negated by other weather inducing opponents.