Uxie

Uxie is a fairly one-dimensional Pokemon, yet it finds itself a place in the UU metagame as a reliable Trick Room setter thanks to its ability to compress roles, its access to many different utility moves like Stealth Rock and Memento that allow it to support its team in various ways, and its great bulk, which allows it to sponge hits from Pokemon like Cobalion and Mega Aerodactyl as well as super effective hits such as Hydreigon's Dark Pulse and Krookodile and Alolan Muk's Knock Off. However, Uxie is almost entirely restricted to Trick Room teams due to being outclassed both offensively and defensively by other Psychic-types, such as Latias, Bronzong, and Necrozma, as it's unable to perform any other roles as effectively as them. Uxie is also very passive, as it can't do much damage to most Pokemon, meaning it's dead weight in most scenarios outside of performing its role. Substitute users like Nidoking and Kyurem, for example, can take advantage of it, as they're capable of blocking Memento. Furthermore, Uxie faces competition from other Trick Room setters such as Cresselia, which has access to Lunar Dance and reliable recovery, and Bronzong, which benefits from its Steel typing and has access to Explosion. They are usually better picks for a Trick Room setter, but this is only the case on Trick Room teams that are only using one dedicated setter.