Terrakion

Terrakion is one of OU's most fearsome and underrated wallbreakers, and at a quick glance, it isn't difficult to see why. With a respectable Attack stat and extremely high-powered STAB attacks that have phenomenal coverage, Terrakion is an absolute nightmare to switch into. Furthermore, its ability, Justified, makes opponents fear using Dark-type moves multiple times, as Terrakion is able to get a free Attack boost off of these resisted attacks. As a result, Terrakion is a decent check to Weavile, Tyranitar, and Bisharp for offensive teams. Its Speed tier is just enough to revenge kill base 100s, especially the likes of Manaphy, Charizard, Jirachi, and Mega Gardevoir. However, while Terrakion is a menace offensively, its typing and mediocre bulk leave it wanting more in terms of defensive prowess. Being weak to common offensive attacking types, such as Ground, Fairy, Fighting, Water, and Steel, means switching Terrakion in is difficult, even on certain Knock Off users. On top of this, Close Combat's defense drops make it even easier to revenge kill with priority from the likes of Azumarill, Scizor, and Talonflame. Choice Scarf Terrakion lacks the raw firepower to break past the likes of Clefable, Hippowdon, Slowbro, and Landorus-T, while other more powerful sets are easily revenge killed due to their Speed. Nevertheless, even with its downsides, Terrakion proves itself as one of the most devastating wallbreakers in the tier and is a strong choice for most offensive teams.