Uxie is a small, gray, fairy-like Pokémon with two gray tails that are each encrusted with a red gem. Uxie has a partially yellow face with another red gem encrusted into its forehead. Its head faintly resembles that of a helmet or a human brain. Uxie always has its eyes closed, as it can wipe out the memory of those who see its eyes.

Uxie is both feared and respected for its ability erase the memories of evil people. Uxie's spirit can leave its body without dying, and return at will. It created all knowledge in the Pokémon universe. Notably, when Uxie first emerged, humans gained the knowledge needed to solve problems and improved their quality of life. In Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness, it is shown that Uxie can create an illusion. It was also shown in The Needs of the Three! and The Battle Finale of Legend! to teleport itself, as well as other Pokémon and humans. Though it is very shy, Uxie will attack with force if it or the other lake guardians are threatened. Uxie has been referred to as "The Being of Knowledge." Uxie and the other lake guardians have the power to calm Dialga/Palkia should the deity be enraged. In Pokémon Legends: Arceus, Uxie is shown to be capable of speech via telepathy.

Uxie and the other lake guardians are the only known Pokémon capable of learning the move Mystical Power.

(Source: Bulbapedia)