Uxie is indeed a rare Pokemon appearing only once in the games it can be caught in. Uxie is part of a classification of Pokemon called Legendary Pokemon. Legendary Pokemon are the rarest Pokemon and can only be caught once per game they appear in.
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The rare Pokemon which you can get before the Elite Four in Pokemon Platinum are Giratina, Mesprit, Uxie, and Azelf.
Rare Pokemon in PearlO.K. lets see there is mesprit, uxie, azelf, palkia, dialga, arceus, heatran, regigigas, cresselia, rotom, giratina, lucario, darkrai, and a few others you can migrate also but that's all i can think of right now shaymin
physic
Uxie
memmemem whatever that means,#146 is Uxie