Weavile

Weavile is one of the fastest Pokemon in the metagame, able to outpace OU staples such as Latios, Alakazam, and Starmie. This means, unlike Tyranitar and Scizor, it's able to Pursuit trap the aforementioned Psychic-types without a Choice Scarf. Another appealing aspect about Weavile is its access to STAB Ice Shard, meaning that it can revenge kill sweepers like Garchomp, Dragonite, Landorus-T, and Thundurus-T. This makes Weavile good against offensive teams that rely on these Pokemon outspeeding foes after a Speed boost to sweep.

Unfortunately, Weavile has several egregious flaws. While it's much faster and more efficient at disposing of specific Pokemon, it can't switch into any of them because of its weakness-laden typing that's exacerbated by its vulnerability to entry hazards, especially Stealth Rock, thus worsening its consistency as a trapper. For these reasons, Weavile is often passed over for Tyranitar and Scizor, as the former sets up sand, granting it better defensive utility against special attackers, and can set up Stealth Rock, while the latter has a much better defensive typing and more versatility, making it easier to fit on teams. Additionally, both Tyranitar and Scizor have much better coverage and defensive utility than Weavile, lending themselves to a greater variety of teams.