This Victreebel is a grass/poison-type Pokémon previously owned by Magikarp Salesman.
The Magikarp Salesman traded Victreebel to James as a Weepinbell because Weepinbell can use Sweet Scent which can be used to attract other Pokémon for Team Rocket to Capture. Soon after the trade Weepinbell evolved into Victreebel. After it evolved it tries to gobble Jessie who then tells Arbok to send it flying. Meanwhile, the Magikarp Salesman was being biten on the head by James' old Victreebel. He kicked it away realizing it wasn't good for him. The two Victreebel then met and fell in love and skipped away into the forest.