It is not known to evolve into or from any other Pokémon.
Along with Mesprit and Azelf, Uxie is one of the lake guardians created by Arceus. It is known as the Being of Knowledge (Japanese: 知識の神Chishiki no Kami, "God of Knowledge") in Sinnoh myths.
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 them. It is both feared and respected for its ability to 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 and gave humans the ability to adapt and learn as life goes on, leading it to be referred to as the "Being of Knowledge" in the past. Notably, when Uxie first emerged, humans gained the knowledge needed to solve problems and improved their quality of life. In Pokémon Mystery Dungeon, it is shown that Uxie can create illusions. It was also shown in The Needs of the Three! and The Battle Finale of Legend! to be able to teleport itself, as well as other Pokémon and humans. Though it is very shy, Uxie will attack with force if it or its friends are threatened. Alongside the other lake guardians, Uxie is needed for the creation of a Red Chain, either through gems extracted from its body or through its claw. Together, they're also capable of destroying a Red Chain. They even have the power to calm down Dialga or Palkia should they be enraged, but not both at once. Uxie lives in Lake Acuity, specifically in the Acuity Cavern at the center of the lake, thus gaining its title as a lake guardian. In Pokémon Legends: Arceus, Uxie is shown to be capable of speaking human language via telepathy.
Uxie, the Knowledge Pokémon. A Psychic type. Uxie is called "The Being of Knowledge." It is said to have given people the wisdom to solve life's problems.
In the Diamond & Pearl arc, Uxie was to be captured as part of Team Galactic's plans. Commander Jupiter led the operation to capture Uxie, and overcame resistance from Maylene, Candice and Platinum in order to do so. Uxie connected with Platinum the most, as Platinum had great wisdom; she had also been to Lake Acuity before and saw Uxie, though she did not remember the event. It first appeared in Tackling Tangrowth.
Pokémon Diamond and Pearl Adventure!
Along with Mesprit and Azelf, Uxie was captured by Team Galactic to create the Red Chain so that they can control the Legendary Dialga. It was eventually freed and helped stop Dialga by breaking the Red Chain. It first appeared in A Novel Test!!.
Occasionally, on the Spear Pillar stage, the lake guardians make cameo appearances during the fight; they do nothing, however.
Trophy information
A Knowledge Pokémon. It's said that Uxie's emergence gave humans the wisdom to improve their lives. This Pokémon possesses the ability to erase the memory of those who see its eyes. Uxie uses status-altering moves in battle--its frequent use of Yawn is very effective in putting foes to sleep. Uxie makes its home in Lake Acuity in the Sinnoh region.
Uxie seems to be based on a pixie or a fairy and the color yellow. The lake guardians could possibly have originated from the Imperial Regalia of Japan, which are also called the Three Sacred Treasures. Uxie would be the Yata no Kagami, which embodies wisdom and honesty. Additionally, it may draw inspiration from Cherubim—one of the three highest ranking angel classes in Christianity—characterized by knowledge.
Another possible inspiration for this Pokémon could be the Greek goddess Hestia (Vesta in Roman) as both are part of a female trio that is highly related to the main trio of both their respective franchises of origin, with both sharing a shy disposition.
Name origin
Uxie and Yuxie may be a combination of U of the acronym UMA (Unidentified Mysterious Animal, wasei-eigo for cryptid) and pixie. It may also involve the pronoun you.
This Pokémon article is part of Project Pokédex, a Bulbapedia project that aims to write comprehensive articles on each Pokémon species, as well as Pokémon groups and forms.