Venonat

Venonat is a furball-shaped, fanged Pokemon. It lives in the shadows of tall trees and loves to eats insects, and is attracted by bright lights at night. In "The Ninja Poke-Showdown," Ash and the gang are attacked by a female ninja and her trained Venonat. The battle rages until her brother, the master ninja, arrives on the scene to finish the battle.

First appearance: Episode 32—"The Ninja Poke-Showdown"