Argus Steel is a famous Pokémon bandit that was attempting to catch
Diancie in order for it to make diamonds for him. His daughter is
Millis Steel. He owned a large flying ship that could partially cloak but it was destroyed by
Yveltal during a battle and it crashed into a lake. He loves chocolates and had ordered some all the way from the Houen region. He is big in stature and his daughter worries about his health by eating too many chocolate.
In the movie credits, he and his daughter are seen running a chocolate shop.