As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Vileplume:
Did you know? Vileplume’s toxic pollen triggers atrocious allergy attacks. That’s why it is advisable never to approach any attractive flowers in a jungle, however pretty they may be. Vileplume has the world’s largest petals. They are used to attract prey that are then doused with toxic spores. Once the prey are immobilized, this Pokémon catches and devours them.
Source: @Pokemon
Source: Pokemon