I feel like a pokemon based of the Batman character Poison Ivy would be quite interesting. She could have the kissing moves Sweet Kiss, Lovely Kiss and Draining Kiss while adding a new one - Poison Kiss. Give her vines around her arms allowing her to use Wrap, Vine Whip and Power Whip, and then create some plant-based variants of Vespiquen's signature moves Attack Order, Defend Order and Heal Order, making the plants in the area attack her opponents, raise her defences or heal her as needed (or rather than make new, similar moves, change it so that the Order moves change type depending on the user, remaining bug type for Vespiquen and grass type for this new pokemon. Could even make it so that it can be water type and give it to Wishiwashi)
Other moves: Attract, Acrobatics, Ingrain, Sweet Scent.
Possible abilities: Chlorophyll, Poison Touch
Typing: Grass/Fairy or Grass/Poison