Heatran

Heatran's amazing defensive typing leaves it with only three weaknesses, as well as an impressive nine resistances, one immunity, and an immunity to two status conditions. Its stats enable it to run multiple sets, making it very unpredictable. It is able to check or counter many top-tier threats such as Kyurem-B, Thundurus, and Sableye. Its great natural bulk allows offensive sets to take hits even without investment and makes defensive sets tough to tear down. While its great support movepool allows it to help its team throughout the battle, its lack of setup moves sometimes gives it trouble against bulky foes, and it also lacks a form of reliable recovery. Additionally, it has a 4x weakness to a very strong and common attacking type in Ground, and its other two weaknesses are to types that are prevalent and strong. It also often suffers from four-moveslot syndrome, and its below average Speed tier hurts its longevity and attacking potential.