Weezing

Save for a few brief stints in OU, Weezing has been a defensive behemoth in the UU tier throughout its existence. With the release of Black and White, Weezing has returned to its original role as the best Fighting-type counter in UU. Weezing's Poison typing, along with its ability, Levitate, gives it a lone weakness to Psychic-type attacks, an immunity to Ground-type moves, and, more importantly, a useful Fighting-type resistance. This, coupled with Weezing's excellent Defense and access to useful moves such as Haze, Pain Split, and Will-O-Wisp, makes it the ideal addition to any team plagued by Fighting-type threats such as Hitmontop.