This is Magearna. Outfitted with a metallic body, this artificial Pocket Monster was created by humans 500 years ago. The character is set to debut in the upcoming Pokémon film, Volcanion and the Ingenious Magearna, which is due out this year. Via Pokémon.com:
In this latest cinematic adventure, Ash meets the Mythical Pokémon Volcanion when it crashes down from the sky, creating a cloud of dust — and a mysterious force binds the two of them together! Volcanion despises humans and tries to get away, but it's forced to drag Ash along as it continues its rescue mission. They arrive in a city of cogs and gears, where a corrupt minister has stolen the ultimate invention: the Artificial Pokémon Magearna, created 500 years ago. He plans to use its mysterious power to take control of this mechanical kingdom!
Volcanion and the Ingenious Magearna opens in Japan this winter and will, of course, also feature Volcanion.
Top photo: Pokemon-movie.jp