Serperior

Serperior is very useful in the STABmons metagame because of its access to an excellent ability in Contrary. With a very high base 113 Speed and a strong 130 Base Power STAB move to abuse Contrary with to gain boosts in Special Attack, Serperior is a top threat. Because of its access to Spore to cripple its checks and counters and gain free turns, it can sweep unprepared teams at a moment's notice. Serperior's Speed allows it to outrun notable Pokemon such as Mega Diancie, Mega Latias, Gengar, and Thundurus. Unfortunately, its stats other than its Speed are subpar, and it often needs to get to +2 or +4 in Special Attack in order to successfully sweep. With the incline in usage of Pixilate FakeSpeed from the likes of Sylveon, Serperior really struggles due to its lacking bulk. Serperior also has limited coverage, as it is heavily reliant on Hidden Power, and it is held back because it is very predictable, but it is nonetheless a very good Pokemon in STABmons.