In the lead-up to the tournament, Ash and Misty get into a heated argument over who will win. Brock cools down the argument and then reminds Ash that he only has one Water Pokémon, so Ash calls Professor Oak from the Pokémon Center. At Oak’s suggestion, Ash sends through his Bayleef and receives Kingler. Back at Professor Oak’s Laboratory, Oak calls out Bayleef, but Bayleef’s obsession with being with Ash causes her to go into a panic, and she eventually rams into Oak.
(Source: Bulbapedia)
