As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Orthworm:
Did you know? When attacked, this Pokémon will wield the tendrils on its body like fists and pelt the opponent with a storm of punches. This Pokémon lives in arid deserts. It maintains its metal body by consuming iron from the soil.
Source: @Pokemon
Source: Pokemon