As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Mr. Mime:
Did you know? The broadness of its hands may be no coincidence—many scientists believe its palms became enlarged specifically for pantomiming. It’s known for its top-notch pantomime skills. It protects itself from all sorts of attacks by emitting auras from its fingers to create walls.
Source: The Pokémon Company