The Unova Stone is a special Evolution item in Pokémon GO used to evolve several Pokémon from the Unova region. These Pokémon need both the required Candy and one Unova Stone. Which Pokémon Use an Unova Stone? Seven Pokémon currently use the Unova Stone for their final evolution in Pokémon GO:Pansage evolves into Simisage with 50 Pansage Candy and one Unova Stone. If you only have one Unova Stone, choosing the right Pokémon matters.