Pokémon the Movie: Volcanion and the Mechanical Marvel is now playing on Pokémon TV during the month of June. You can watch it via the Pokémon TV application or through the official website. As the title suggests, it revolves around the Mythical Pokémon Volcanion and the Artificial Pokémon Magearna. You can check out the English dub trailer for the film by clicking here.
Source: The Pokémon Company