Samurott

Samurott is one of the best offensive Water-types in the NU tier. Thanks to its balanced attacking stats, it can effectively run physical, special, and mixed sets. Having access to near-perfect coverage with moves like Hydro Pump, Ice Beam, and Grass Knot, it rarely finds itself hard walled by any Pokemon. It also has access to Swords Dance and Aqua Jet, allowing it to perform as a sweeper, as well as another utility move in Taunt, which can give it the opportunity to break through Pokemon like Vaporeon and defensive Slowking by preventing them from recovering. It can also prevent status moves from the likes of Mega Audino and Stealth Rock from Pokemon like Druddigon. Samurott has quite a few checks, however, such as Heliolisk and Vaporeon, both of which tank Water-type moves with ease, preventing Samurott from spamming Hydro Pump and Liquidation. Heliolisk works especially well against Samurott, as it is faster and puts a stop to both the special and Swords Dance sets. Samurott is further hindered by its mediocre Speed, meaning you'll have to keep it healthy so it can set up and sweep. This also makes it easy to revenge kill with Pokemon that are resistant to Aqua Jet, such as Sceptile and Whimsicott.