Sylveon

Sylveon's great matchup against top threats like Scrafty and Flygon alongside its set versatility makes it one of the premier Fairy-types in NU. Wallbreaking sets can break through common special walls like Alolan Muk and Gastrodon. Sylveon can also run a more defensive set, letting it heal up teammates that it naturally synergizes with like Incineroar, Registeel, and Swampert that lack reliable recovery. Sylveon has great Special Defense, letting it take on special wallbreakers like Inteleon and Diancie with little or no investment. However, both of Sylveon's roles are contested by another Fairy-type, namely Florges, as Florges has access to Trick for Choice Specs sets as a way to decommission Steel-types and special walls, and it has higher Speed, meaning its wallbreaking sets can outpace more threats and Wish passing sets can invest more in its Defense. On top of that, Sylveon must compete with other Wish passers such as Vaporeon and Scream Tail, which can provide more utility at times with the former having access to Haze and Flip Turn, while the latter can provide Thunder Wave and Encore. Sylveon is also walled immensely by Steel-types like Copperajah and Registeel, but their lack of recovery leaves them susceptible to being worn down over the course of a game. Wish sets also tend to be passive and easily taken advantage of by the aforementioned Steel-types and setup sweepers like Munkidori and Incineroar. Sylveon's subpar Defense can also let it be broken through, as it's typically forced to take Knock Off for its team all while being whittled away at by entry hazards.