Once upon a time, there were three wish-granters who roamed the world, granting the wishes of any Pokemon who sought them out. It Is, who is all types at once, granted them a piece of Its power, and when It Is left to do other work, the three wish-granters were left behind to fulfill the hopes and dreams of Pokemon the world over.
For a while, all was well.
Soon, however, the three became dissatisfied: the work was boring, it was hard, and--worst of all!--It Is had not given them the power to tell the truth in the hearts of others, so that the wishes they granted were often used for petty or evil ends.
That Which Heaved And Quaked was first to become angry, and began to make trouble. That Which Roared and That Which Lit Up The Sky followed in his wake, and it was not long before their wishes granted became wishes much regretted, for though the wishes were indeed made Real as asked, they were but cruel and twisted visions of the Pokemon's desires. These wishes, granted in anger, are why the land to the west no longer grows... but that is a story for another night.
Tonight, child, I will tell you about That Which Lit Up The Sky and the City of Lights.