Omastar

In spite of facing stiff competition from other bulky Water-types, namely Milotic, Blastoise, and Azumarill, Omastar can still hold its own. Omastar is the only Pokemon in UU capable of setting up both Stealth Rock and Spikes, which has turned our little prehistoric friend into a staple on stall teams. Furthermore, Omastar's base 115 Special Attack and access to Swift Swim allows it to function as a fearsome rain sweeper that is capable of plowing through teams in a matter of turns.

Omastar is not without its fair share of faults, however. Its awful defensive typing, which grants it weaknesses to Ground-, Fighting-, Electric-, and Grass-type attacks; low Special Defense; and lack of a reliable recovery move are major drawbacks that severely hinder Omastar's durability. Despite these disadvantages, do not underestimate Omastar, as it can run (or slide...) circles around unprepared teams.