In Which Wurmple's Which?, May argued with Jessie over which one of them had the better Wurmple. After Max concluded that the two Wurmple are exactly the same, they began battling, but Team Rocket was sent blasting off by Pikachu. May soon realized that she has Jessie's Wurmple and that Jessie has hers. While with Team Rocket, Wurmple caused trouble for them by eating what little food they had, proving to be far more gluttonous than Jessie's Wurmple. Eventually, Wurmple was handed back to May in exchange for Jessie's Wurmple.
In Seeing is Believing!, Silcoon once again battled Cascoon, in an attempt to prove to Jessie that her Pokémon was not a Silcoon, evolving into Beautifly in the process. Later on, Cascoon evolved as well and the two once again fought, with Beautifly winning.
As a Wurmple, it would gorge itself on food and then fall asleep, unlike Jessie's more sedate and well-behaved Wurmple. It also had a remarkably lazy personality. When it evolved into Silcoon and then Beautifly, however, it became more calm and mellow. As a Beautifly, it often likes to sit atop May's head, and it appears to only do so to those it considers her friends, such as when it landed on top of Ash's head after it and May came to Sinnoh.