Can also be bought in Olivia's jewelry shop in Konikoni City, for 3,000P, or found during the "Path for Brilliant-Stone Hunting!" mission on Isle Aphun in Poké Pelago. On Route 8, behind the trailer at the Fossil Restoration Center. A Water Stone causes the following Pokémon to evolve: On Route 8, underwater southwest of where Wimpod can be found (requires Lapras Paddle/Sharpedo Jet). A Fire Stone causes the following Pokémon to evolve: In Diglett's Tunnel, north of the stairs in the west area (requires Tauros Charge). Both evolutionary items and stones are consumed upon the Pokémon's Evolution. The difference between these two is that an evolutionary stone is used on a Pokémon and then causes instant Evolution, while an evolutionary item is held by a Pokémon and then causes Evolution when a certain event happens, such as if the Pokémon is traded or leveled up.
One of these ways is by evolutionary stone or item. Pokémon can evolve in many different ways. Walkthroughs Evolutionary Stone and Item Locations