Heatran

Heatran has a unique niche in Ubers due to its very valuable resistance to the extremely powerful and common Dragon-type attacks, as well as a unique set of other resistances backed by respectable bulk. In addition to absorbing Dragon-type attacks, Heatran can successfully roast other Steel-type Pokemon such as Forretress and Ferrothorn, who can otherwise be troublesome. With a Speed stat just good enough to outpace stall-based Pokemon and access to great moves such as Taunt, Roar, and Toxic--as well as the ability to scare away the aforementioned defensive Steel-types--Heatran is incredibly useful in Ubers as a stallbreaker. Although Heatran's Special Attack stat is nothing to scoff at, it is outclassed offensively by other Pokemon such as Reshiram and Ho-Oh. A STAB Fire-type attack will still pack a punch in the sun, though. Heatran is definitely worth using and can be a major threat to stall teams when played correctly.