Stopping for lunch alongside a beautiful lake on their way to Nimbasa City, Ash decides to conduct some special training with Oshawott to teach it how to open its eyes underwater, while Iris keeps an eye on all the other Pokémon as they run off to play. During playtime, Scraggy encounters a group of Foongus and—as usual—greets them with a headbutt. The angry Foongus respond by shooting poison spores at our heroes’ Pokémon, making Pikachu and the others ill!
Iris agrees to watch over the poisoned Pokémon while Ash, Cilan, and Oshawott go to find the cure: a water plant called Remeyo Weed, which grows in tight crevices at the bottom of the nearby lake. Cilan waits on the shore while Ash guides Oshawott, who still won’t open its eyes, down to the lake bottom. Suddenly, they are attacked by a group of Tympole, commanded by a powerful Palpitoad! Oshawott finally manages to open its eyes so it can battle back, and quickly drives off the attackers.
But the danger isn’t over. Palpitoad’s ally Stunfisk arrives and turns on Ash and Oshawott, driving them out of the water with its shocking attacks. Fortunately, Cilan is an accomplished fisherman, and he manages to catch Stunfisk—and when Palpitoad surfaces to come after Oshawott again, Ash manages to catch it with the help of Oshawott’s Aqua Jet, now with much better aim!
With Palpitoad and Stunfisk out of the way, Oshawott has no trouble gathering the Remeyo Weed so Iris can make medicine for the ailing Pokémon. And so, our heroes have added two new Pokémon to the family, and Oshawott has conquered a major fear!