Ash's Kingler

Ash's Kingler is the seventh Pokémon obtained by Ash in Kanto.

Biography
Ash captured Kingler as a Krabby in IL013: Mystery At The Lighthouse so he could prove to Misty that it was not a fluke that he captured his other Pokémon. Immediately after capture, Krabby's Poké Ball teleported away, due to Ash already having six Pokémon on his team. Brock later explained that Krabby was sent to Professor Oak.

Ash decided to use Krabby in the first round of the Pokémon League in Round One - Begin!, reasoning that it would be perfect on a Water battle field, despite the fact that Krabby had never battled before. Krabby managed to defeat Mandi's Exeggutor and subsequently evolved into Kingler. Kingler then went on to defeat Mandi's Seadra and Golbat, winning the match for Ash. Kingler was also used on the Ice field, where it defeated Pete Pebbleman's Cloyster, before falling to his Arcanine.

Kingler stayed at Prof. Oak's lab during Ash's journey through the Orange Islands and Johto.

Kingler was planned to be used in the Silver Conference, but was injured before the match and so Ash was forced to use Squirtle.

Kingler was shown informing the other Pokémon of Butch and Cassidy in Showdown at the Oak Corral. He was also seen making friends with Ash's Corphish in The Right Place and the Right Mime.

Trivia

 * Apart from Ash's Muk, Kingler has had the least appearances out of all of Ash's Pokémon.
 * Kingler is Ash's only Pokémon to sweep an entire league match by itself (not counting one on one matches).
 * Ash's Kingler has used more moves in a single episode than any of Ash's other Pokemon, using eight moves in Round One - Begin.