Tyranitar

Tyranitar is one of the most popular Pokemon in the VGC 2012 metagame, and for good reason. It has very impressive stats, the best of which is its massive base 134 Attack. With a base Speed of only 61, however, it is one of the slower Pokemon in the VGC 2012 metagame. This can be taken advantage of by providing it with Trick Room support, or simply by using it to underspeed opposing weather Pokemon. Tyranitar's Sand Stream ability initiates a sandstorm whenever Tyranitar enters the battlefield; when two weather inducers are sent out at the same time (the beginning of the battle, for example), the slower Pokemon's weather stays in effect. Tyranitar's Rock / Dark typing gives it two very useful STAB attacks, but also provides it with a horrific 4x weakness to Fighting-type moves, a very popular attack type in the VGC 2012 metagame. Furthermore, Tyranitar is weak to Ground-, Water-, and Grass-type moves, all of which are common in the metagame as well. Thankfully, Tyranitar's weaknesses to Water- and Grass-type attacks are to a certain extent offset by the Special Defense boost that Rock-types receive during a sandstorm.