Well...first you surf at Jubilife city(the dock to the left) to get to canalive city then go across the bridge in the middle. On the other side the gym and a boat will be there. Talk to the man by the boat and say yes to him. You will go to a place called Iron Island. At the end of the island there will be a item, the shiny stone! Pick it up and give it to your roselia and ka-boom! Roserade!
