Lunatone and Solrock never appear in the same region at the same time in Pokémon GO

Lunatone and Solrock lead the charge as Rock and Ground-type Pokémon from the Hoenn region arrive in Pokémon GO. A bevy of Rock- and Ground-type Pokémon have joined the ever-expanding list of Pokémon originally discovered in the Hoenn region showing up in Pokémon GO. Twenty-three additional Pokémon now appear in Pokémon GO for the very first time. Of particular note are the mighty Lunatone and Solrock, which can be found throughout the world, but never in the same region at the same time. Trainers should also be on the lookout for other familiar Pokémon like Aggron, Trapinch, Nosepass, Camerupt and Shiny Aron. So stock up on Poké Balls and head on out for your next Pokémon GO adventure. That Pokédex isn’t going to complete itself!

Source: Pokemon.com