As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Victreebel:
Did you know? Victreebel has a long vine that extends from its head. This vine is waved and flicked about as if it were an animal to attract prey. When an unsuspecting prey draws near, this Pokémon swallows it whole.
Source: The Pokémon Company