I learned recently that Vileplume and Exeggutor from the Southern Island set do not feature any additional Pokémon in their artwork. I’ve always thought that all 18 cards in the set featured other Pokies, but apparently not.
Vileplume actually stands right next to both Oddish and Paras in the full artwork:
Despite this, the Vileplume card doesn’t feature either of them:
Sadly, neither Oddish nor Paras make an appearance in the artwork of any of the other Southern Island cards, either.