Raticate

This is the final stage of evolution for Rattata. It uses its long whiskers to maintain its balance, and it slows down if its whiskers are cut off. A terrifying Pokemon when trained properly, Raticate's fear inspiring look can surprise all but the most determined opponents. In "Battle Aboard the St. Anne," Ash and company meets a distinguished gentleman and Ash trades his Butterfree for the gentleman's Raticate.

First appearance: Episode 15—"Battle Aboard the St. Anne"