Corphish

Thanks to Adaptability and a decent offensive typing, Corphish is a fantastic choice for many offensive teams. A combination of Knock Off and Crabhammer means that even Pokemon that resist Crabhammer are usually unable to safely switch into Corphish more than once, rendering it an extremely potent wallbreaker. It is also very useful against offense, as its Adaptability Aqua Jet is one of the strongest priority moves in the metagame. Boosting moves such as Swords Dance and Dragon Dance allow it to attempt a sweep with a small amount of support. Corphish struggles somewhat with its mediocre bulk and sub-par Speed, but it is usually fast enough to outspeed most walls. However, despite its good movepool, it does not have enough moveslots to fit all the moves that it wants, and will sometimes struggle against common Pokemon such as Foongus and Croagunk.