Uxie is worshiped throughout Sinnoh as a god of knowledge, its gold and gray color supposedly representative of paper, whether new or old and decaying. This is a re-purposing in which one minor aspect of this ancient deity was elevated above all others by a changing era, in order to preserve a faith while shedding major tenets which had become viewed as abhorrent. For back before the revolution, in the age of opulent nobles, chiefs, and kings, Uxie was a god of merchants and indeed of greed, its original colors lost for it had bathed so long in silver and gold.
Yet as Uxie's cult changed so dramatically, there was no divine wrath from Lake Acuity, where Uxie sleeps, and a stubborn few who held to the old teachings began to wonder if this meant that Uxie itself had died. In an expedition motivated as much by rumors of great treasure as by concern for their god's health (for breaching the shrine was itself heresy) they dove into Uxie's cave, disturbed its deep slumber, but found neither the hoard of gold preached in ancient times nor the great library which was now supposed to rest beneath the waves.
What they did find was a tiny pixie of a god – far smaller than the depictions of old, but otherwise recognizable – levitating in midair. Unlike the overwhelming majority of those who disturb the gods, they suffered no divine wrath, for Uxie knew their hearts and approved of their curiosity and even their greed. Each member of this expedition would become a remarkable polymath when they surfaced, and their theological views had reversed completely: steadfast believers that Uxie stood for greed became the most fervent advocates of the view, which they once thought heretical, that Uxie was a god of knowledge.