There was a long lost scroll in an ancient pokemon forest. Unfortunately two humans found it. It said "A pokemon, greater than dreams will be born. An Eevee with powers to crush worlds. This Eevee will appear normal, but to find her simply provoke her to use her powers. Then hurt a loved one of hers and she will turn gold. And only until she gets revenge will she return back to normal."

I'm going to the rest bit by bit