Salamence

For what is generally considered a purely offensive Pokemon, Mega Salamence boasts impressive defenses and a unique support movepool, making it a top threat in the Doubles OU tier. Salamence has a lot of flexibility in its ability to use a mixed set or specialize in either physical or special attacks. However, it often relies on its speed to maintain offensive pressure, so if it's not attacking first, it can be liable to taking a lot of damage. The all-out attacking and Dragon Dance sets have somewhat similar checks but are played to entirely different win conditions, so any opponent of Mega Salamence must tread lightly until its set is revealed. Unfortunately, the prevalence of other Pokemon 4x weak to Ice in the tier, such as Landorus-T and Zygarde, means that most teams have built-in Salamence checks. Additionally, the prevalence of Stealth Rock means that Salamence has to be careful about how many times it switches in and out.