Cacturne

Cacturne's incredible offensive stats and large movepool make it a top wallbreaker in the PU metagame. Unlike most other wallbreakers, it has access to a very strong priority move in Sucker Punch, making it difficult to revenge kill and allowing it to threaten offensive teams. Cacturne also has the ability to utilize both specially and physically based sets, which share no counters, while a Swords Dance set can easily sweep in the late-game. Unfortunately, defensive answers to Cacturne like Clefairy, Vullaby, and Muk are fairly common, though only Muk can reliably counter both sets, whereas Monferno, the best offensive Cacturne check, is very common and can act as a potential switch-in. Lastly, Cacturne's low Speed, poor bulk, and bad defensive typing mean it is overly reliant on Sucker Punch, which can be taken advantage of with status moves such as Will-O-Wisp and Encore.