Metagross

Metagross has a very small niche in BW OU as the only Steel-type that learns Pursuit, Stealth Rock, and Explosion, which makes it a fringe option on hyper offense teams that would like to compress a way to remove Latios and a Stealth Rock setter that maintains momentum into one teamslot. However, it's often not worth using due to the existence of better offensive Stealth Rock setters like Garchomp, Jirachi, and Landorus-T, as they are faster and have much better matchups against the majority of the metagame. It's also outclassed by other Steel-types, including Ferrothorn, Excadrill, Jirachi, Heatran, and Skarmory, in every other role as a result of their better defensive profiles, letting them more consistently check many of the metagame's offensive threats, and superior support movepools, letting them more easily set up or even remove entry hazards.