Dream Islands

After you have befriended Drifloon, you have the ability to use its specialty to go to a Dream Island. Dream Islands are a special island you can visit once per day in order to get a variety of rare items and ore such as gold and Poké Metal

These islands have no wild Pokémon in, but can have varius items, recipes and more for you to find while you are stripping them of all of their resources

Once you have returned from the Dream Island, you can use the resources as you see fit, though anything you have left on the island cannot return as the island resets at the end of the day so be sure to return to it if you left something there.

If you use the Ditto Doll or Substitute Doll, there is a chance that you can find a Legendary Pokémon