Its maybe not the most creative one but Water Spout Blastoise is a very solid pokemon for UU or NU (if it ever becomes NU again). It has pretty good speed which makes blastoise very good. Hiddenpower grass allows you to hit pokemons like Quagsire, Kabutops, Whiscash.
Nature: Timid
Item: Choice Specs
Moves: Surf / Water Spout / Ice Beam / Hiddenpower Grass