Wurmple

Wurmple (ケムッソ Kemusso) is a -type Pokémon introduced in Generation III. Wurmple's only known moves are Tackle and String Shot. At level 5 it learns Poison Sting, seeing it has two stingers on its rear. When Wurmple reaches Level 7 it will evolve into either Silcoon or Cascoon, depending on its personality value (example: a Wurmple with a bashful nature will evolve into Cascoon.

In the Anime
Both May and Jessie owned Wurmples that evolved into Beautifly and Dustox respectively.