[TruthfulCake]

First post. Will go by my White 2 experience so far.

Azurill for High/Top tier.

Pros:
+ Early availability. Floccesy Ranch with 15% encounter rate means that you will most likely encounter at least one before the first gym.
+ Pure Power - 'nuff said. Also, with TM21 obtainable in the same place you can catch it, it has access to a 70+ base power STAB move immediately.
+ Early evolution. Happiness evolution is ridiculously easy in BW2, and once it evolves, it is usually just 1-2 levels away from evolving into its final stage.
+ Coverage. Starts with STAB Frustration, gets Work Up + Water Gun/BubbleBeam and Return for wide normal coverage. Once it evolves it is several level away from Aqua Tail, and Dig is obtainable soon after. Ice Punch tutor in Driftveil.
+ Fast growth. Needs little experience to level up.
+ Respectable bulk. Water-typing, 100/80/80 defenses as Azumarill.
+ Good Gym performance. With the exception of Elesa, whom you can handle with Dig or Ground-types, it performs well. From Clay onward, Aqua Tail + Ice Punch owns the three consecutive Gyms.
+ Utility. If you decide that Return OHKOs are overkill and Aqua Tail is a little unreliable, it learns Waterfall and Strength afterward, saving you the need to find a Water-type HM slave. Learns Surf too - Waterfall, Strength, and Ice Punch are all it needs with Pure Power.

Cons:
- Slow. Doesn't stop Magnemite from dominating the game, though, as you earn speed EVs and the AI Pokemon keep having zero. Also, Quick Claw in-game for an average of one first-strike every four turns.
- 50% chance of encountering an obese version that hits like a girl and has overkill resistances to things it already resists anyway.

My experience with Azumarill in-game has been positive so far. It feels like BW Lillipup all over again, except with more coverage and better typing.