Pokemon No. 005 in the Pokedex and the evolved form of Squirtle.
Wartortle is the 2nd Stage of Squirtle. While not seen in the actual Anime Gary Oak's Squirtle Evolved into a Wartortle. The first actual appearance of a Wartortle in the anime was in the episode "Beach Blank-Out Blastoise" where Wartorle and Squitle were disgruntled over thier leader Blastoise not waking up. Ash found Jigglypuff stuck in Blastoise's cannon and pulled it free.