>>27792517I don't really have any lore on it, other than this post I saw that said Jirachi blessed the people of Sootopolis to grant Rayquaza the power to Mega Evolve when the world was in catastrophe long ago.
However, I am in love with this pokemon's basic lore. The idea of a pokemon that resides among the stars, and grants wishes to those with yearning hearts, along with a theme like Lake from Diamond/Pearl or Meteor Falls from RS always sends me in a peaceful bliss.