Primarina

With a stellar Water / Fairy typing, a great Special Attack, and good Special Defense, Primarina proves itself to be a prevalent threat in the 1v1 metagame. Its typing is useful for both defensive and offensive purposes, as it enables it to take on many of the tier's most prevalent Water-, Fire-, and Dragon-type Pokemon such as Mega Gyarados, Mega Charizard X, and Kommo-o as well as Ground- and Rock-type Pokemon such as Donphan and Crustle. Very few type combinations resist both Fairy- and Water-type moves, allowing Primarina's high-Base Power STAB moves in Oceanic Operetta and Moonblast to hit most of the metagame neutrally. Primarina can forego Special Attack investment to invest in its Defense to survive powerful hits such as Tectonic Rage from Landorus-T, as it already has enough power with its STAB moves. Access to priority in Aqua Jet allows Primarina to beat Sturdy Pokemon and pick off weakened Pokemon. Access to Encore also allows it to beat passive Pokemon like Mega Slowbro. Although Primarina faces competition from Tapu Fini, it can offer more power and utility with Oceanic Operetta and Encore. However, Primarina is weak to common Grass-, Electric-, and Poison-types such as Mega Venusaur, Zeraora, and Naganadel. Also, Primarina has no way of boosting its power, so it can fall prey to bulky setup Pokemon like Meloetta and Magearna and powerful nukes such as Breakneck Blitz from Porygon-Z.