how do i get a rainbow stone?
Hey SmashedMug,
As DartTK mentioned, in order to get the Mega Keystone that will allow you to Mega-Evolve your pokemon in- and out-of-battle, you will need to beat a
Mega Boss. They will spawn randomly in the wild and they are pretty rare, so it may take a bit to find one. If you have any other questions or concerns, please feel free to let us know and we will help you out as soon as possible! Stay safe and healthy.
Cheers!