Uxie debuted in Pokemon Diamond and Pearl, the fourth-generation games set in the Sinnoh region, as one of the three lake guardians alongside Mesprit and Azelf. Its cry comes from that original Nintendo DS era, and players first heard it when encountering Uxie at Lake Acuity, and the sound later spread through gameplay videos, Pokedex compilations and soundboards. Because Uxie is rarely encountered outside its lake, the cry became a shorthand for rare, secret knowledge in fan edits, and it remains popular with players revisiting Sinnoh.