The Pokémon Company recently gave us a first official look at Marshadow, which is one of the newest Mythical Pokémon revealed for Pokémon Sun and Moon. Also known as the Gloomdweller Pokémon Marshadow is a Fighting/Ghost-type Pokémon with the Technician Ability. It cannot be encountered in normal gameplay; therefore, The Pokémon Company will eventually announce how players can get this Pokémon for their game. Marshadow is also set to appear in Pokémon the Movie: I Choose You later this year.
Source: Bulbapedia
Pokémon Blog 
One thought on “Official artwork and first details revealed for new Mythical Pokémon Marshadow in Pokémon Sun and Moon”