Mantine

Mantine's excellent typing, good special bulk, and various utility options allow it to handle many of NU's top offensive and defensive Pokemon, such as Inteleon, Salazzle, Mudsdale, and Talonflame. Immunities to Ground and Water and a resistance to Fighting define Mantine's defensive presence, allowing it to come in on Choice-locked threats such as Passimian and Golurk and pivot well against other defensive Water-types such as Quagsire. Mantine's Scald and Toxic ensure it isn't overly passive, and it can more easily check physical attackers such as Silvally-Ground and Copperajah by crippling them with a burn. In addition, Mantine is not a sitting duck against traditional Water-type answers such as Toxicroak, Heliolisk, and Vileplume; its access to Hurricane and ability to easily fit Toxic set it apart from Vaporeon, which cannot viably run much to circumvent these checks due to its more restricted moveslots. However, Mantine's physical bulk is less than impressive, allowing threats such as Golurk and Tauros to easily muscle past it with the right coverage. Mantine is also extremely vulnerable to Knock Off from many of the physical attackers it wants to pivot into, as its Stealth Rock weakness means it struggles even more to take hits after losing its item. Finally, though Mantine seems like it would be a good Defog user, it has difficulty effectively removing hazards because it is threatened by most of the tier's common Stealth Rock setters: Diancie and Stakataka can defeat it with their Rock-type STAB attacks, and Copperajah can muscle through it with Rock Slide and Power Whip.