Mamoswine

This generation has been extremely kind to Mamoswine, and it is now endowed with a reliable Ice-type STAB attack: Icicle Crash. Icicle Crash and Earthquake score 2HKOes on nearly everything in the Uber tier, with the assistance of Stealth Rock. Mamoswine also has access to priority in the form of Ice Shard, which can be extremely useful in Ubers with the plethora of Dragon-types that run rampant. Mamoswine also has an ever-useful immunity to Electric-type attacks, which provides it with many opportunities to switch in. However, Mamoswine is not without its flaws. Its below-average Speed is its biggest downfall, and makes it a bit reliant on prediction. Mamoswine's typing makes it vulnerable to all forms of entry hazards, which will wear it down quickly. It also is a bit frail by Ubers standards, and can't take many hits, if any, on the special side. Do not let these downfalls deter you from using Mamoswine; it can be a terror on the battlefield when used correctly.