Ash and Goh are in Cerise Park, looking after the Pokémon living there. Chloe is also there photographing Pokémon, and Yamper’s scurrying around helping everyone. They discover two groups of Pokémon who are fighting because dirty water has driven one group from their usual spot. With Yamper’s help, our heroes find the source of the pollution: Grimer and its nest under the waterfall. As our heroes build Grimer a new nest, Suicune suddenly appears, summoning a gentle rain and restoring the waters of Cerise Park. Before departing, it shares a moment with Yamper, whose efforts helped save the day. Then, Ash receives a message—his next battle opponent is Raihan!