As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Machoke:
Did you know? When it encounters an enemy that’s truly mighty, this Pokémon removes the power-save belt from its waist and unleashes its full power. A popular motif for sculptures, its incredibly well-developed muscles have captured the imagination of many an artist.
Source: The Pokémon Company