The group arrives in Gringy City where everything is dark and gloomy. Pikachu isn’t feeling well and they rush it to the Pokémon Center. Nurse Joy dismisses it as a cold. Meanwhile, in the sewer Jessie and James are going to dive through the sewer system to get into the center to steal Pokémon. Just as they are diving in, the power goes out and so does their air supply. The Pokémon in critical condition at the center are endangered as well. Ash and the group go to the power plant to check things out. While exploring a Magnemite hovers around Pikachu. It leaves fast as a group of Grimer and a Muk attack. They soon discover that the Grimer are blocking the water from coming in and there are too many. The Magnemite that was hovering around Pikachu returns with some Magneton and they defeat the Grimer. One Muk is still left and Pikachu with help from the Magneton defeat it and Ash catches it. Professor Oak is surprised when a Muk arrives in his lab. The people of Gringy City promise to clean up and the group is again on their way.