Ash captured Kingler as a Krabby so he could prove to Misty that it was not a fluke that he captured his other Pokémon. Immediately after the capture, Krabby's Poké Ball teleported away, due to Ash already having six Pokémon in 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, reasoning that it would be perfect on a Water battle field, despite the fact that Krabby had never battled before. Despite the type disadvantage, Krabby managed to defeat Mandi's Exeggutor and the experience it subsequently gained during the battle caused it to evolve into a Kingler.
Kingler then went on to defeat Mandi's Seadra and Golbat all by itself, winning the match for Ash. Kingler was also used on the Ice field, where it defeated Pete Pebbleman's Cloyster, before losing against his Arcanine.
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- 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 Pokémon, using eight moves in "Round One - Begin".
- Ash ordered Kingler to use Hyper Beam against Mandi's Golbat, despite the fact that Kingler could not learn Hyper Beam as a Krabby and had never displayed the ability to use it earlier in the battle, which was against the same opponent who had made it evolve in the first place.
- Kingler is the first Water-type Pokémon owned by Ash to evolve.
At Oak's Lab
At Kukui's house
At Cerise Laboratory