A new trailer for Volcanion and the Mechanical Magearna just debuted at Japan’s World Hobby Fair, which a fan recorded and uploaded to Twitter. The trailer shows several scenes from the film, and it seems Volcanion and Magearna share a “Beauty and the Beast” relationship.
In one shot at 1:10, you can see that Magearna’s old red and white form is “peeling” off its body. This seems to mean the 500 year old “Poke Ball” coloring is just a paint job rather than some kind of special form. It seems the old man who created Magearna gave her the paint job and taught her how to walk, and then over the 500 years the paint wore off.
— ヒノッチ (@hinopika) June 25, 2016