The alarm clock starts ringing, but Chloe switches it off and refuses to get up. Yamper tries yapping to wake her up, but after this fails to work, it fetches Parker to wake her up. However, this also doesn't work, so he calls in their mother Talia, who reminds Chloe that she won't have time to braid her hair for school. Hearing this, Chloe immediately springs out of bed and gets her hair fixed by her mother. Afterward, she goes to have breakfast, with her father Professor Cerise reminding her to feed Yamper. Her parents remark that it is strange that Yamper likes Chloe most out of everyone, despite being the coldest towards it. Soon, the Professor and his daughter leave home to get to work and school respectively.
At the Cerise Laboratory, Ash and Goh shout good morning to all their Pokémon. Goh turns his attention to Ash's Dragonite, and notices it talking with his Scyther and Stantler. He prepares to rush over to intervene in a potential fight, but Ash asks him to wait, and Goh is surprised to see Dragonite hug the other Pokémon. Pikachu and Scorbunny are alarmed to see Goh's Taillow circling around the three Wurmple. Ash and Goh rush over to assist and are surprised to see the Wurmple beginning to evolve. Goh hopes his decision to catch three Wurmple so he will get both a Cascoon and Silcoon will pay off. However, they all simultaneously evolve into Cascoon, much to Goh's dismay.
Meanwhile, in the lab, the power goes out so Ren heads down to the basement to investigate the cause. He calls out his Magnemite to assist, when they are suddenly ambushed by a Gengar. Ren orders a Thunder Wave, but tangles Magnemite in some cords before lashing them both with a Night Shade. Outside, just as Chloe is saying farewell to her father, Ash and Goh jumpscare her. The boys are both excited to show off their new Pokémon, but Chloe reminds them that she still has to get to school. Chloe gets away as Ren arrives for work, keen to discuss a project with the Professor. Seeing Yamper left alone, Ash turns to Goh and asks about Chloe's apparent coldness towards Pokémon. Goh replies that she wasn’t always this way, but shrugs it off as different people having different approaches.
Chrysa and Professor Cerise step into the particularly dark Laboratory and are startled by Magnemite who is still entangled in electrical cords. After regaining their composure, Magnemite shows them to Ren, who is lying lifeless on the floor. As Professor Cerise examines his lab assistant, the answer becomes clear when a Gengar moves right through them. Yamper also notices Gengar hovering above, and attacks it instantly. Goh consults his Rotom Phone for further information, which warns of Gengar's abilities to move between dimensions and absorb heat from its surroundings. As Gengar uses Shadow Ball, Pikachu deflects the attack with an Iron Tail. Gengar resorts to using Psychic, causing many things in the room to float. Ash has Pikachu use Thunderbolt on the Shadow Pokémon, causing the floating items to drop and Gengar to disappear after hitting the ground.
Meanwhile, at school, the homeroom teacher asks her students to announce their dreams for the future. While much of the class is chatting away, Chloe isn’t so enthused. After a few moments to consider, the teacher call for someone to go first. She selects Yeardley at random, and he admits that his dream is a work in progress, making the class laugh at the open-ended response. Chloe is next, and before she can speak, many of her classmates assume that she is just going to follow her father's footsteps and become a Pokémon Professor. The class jeers at Chloe after she admits that she only has Yamper and has never battled before. Chloe starts contemplating whether she likes or dislikes Pokémon before the homeroom teacher intervenes and calls for the class to stop asking questions.
Later, Talia arrives at the school to give Chloe her forgotten lunch but realizes something is up. The pair sits on a park bench to talk things over, and Chloe admits that she felt pressured by others to follow her father's footsteps and like Pokémon. Chloe admits she really doesn't know what she wants to do and turns to her mother to ask when she decided to become an illustrator. Talia reveals to her daughter that she wanted to actually be a comic artist in high school, and despite her best attempts to practice she was preparing to give up on that dream. A young Professor Cerise, however, pleaded with Talia not to give up on her drawing as she seemed to be having fun. Chloe is surprised to learn of this, and her mother explains that while she needed the encouragement, ultimately she was the one who decided to become an illustrator. Talia reminds her daughter that she is only ten years old, and still has plenty of time ahead of her to decide. Chloe smiles in agreement.
Ash and Goh encounter Gengar again, this time down one of the Institute's corridors. Goh sets about catching it, but Gengar simply uses Psychic to repel the barrage of Poké Balls. As the boys pursue Gengar, Mimey is forced to use Psychic to levitate his neatly folded sheets into the air to avoid them being ruined. Gengar unleashes a Shadow Ball, which Pikachu slices with his Iron Tail. Gengar retaliates with an Ice Punch, but Yamper gets caught in the crossfire as Pikachu leaps out of the way, leaving the Puppy Pokémon frozen. Goh immediately has Scorbunny use its heated feet to thaw Yamper from the ice. Gengar fires an even larger Shadow Ball at the boys, with Pikachu using an Electroweb to block it. However, the resulting smoke allows Gengar to escape again.
Meanwhile, the Professor and his assistants are analyzing the Institute's recorded temperature distribution for any sudden drops to find Gengar's location. Chloe arrives from school, where she is greeted by Yamper. Gengar, however, is watching, and the Professor detects a drop in temperature coming from the lobby. Gengar unleashes a large Shadow Ball, though Yamper leaps in the way to defend Chloe from the attack. Chloe immediately scoops Yamper from the ground and prepares to getaway, but Gengar is determined to stop her and blocks her path. As the Ghost-type charges up another Shadow Ball, Ash and Goh run into the room with enough time for Pikachu to use Thunderbolt to defeat the attack. Gengar retaliates by immobilizing the boys and Pikachu with its telekinetic powers. Seeing Gengar's Cheshire grin, Yamper rebounds from the earlier blow and snarls at its foe. Professor Cerise barges into the room and calls for Yamper to use Spark. However, Yamper ignores the command and continues to snarl at Gengar. Cerise is certain that Yamper will listen to his daughter, so he orders Chloe to issue the command. She is reluctant, admitting that she has never called an attack before. Her father reminds her of the dire situation, and after some consideration, she orders Yamper to use Spark. Yamper charges straight through an oncoming Shadow Ball, sending Gengar out of the Institute. Everyone is relieved to see Gengar is gone, while Chloe and Yamper embrace each other in celebration.
That night, Yamper affectionately licks Chloe's face while in bed, and she doesn't seem to mind. Cerise and his wife peek through the doorway and are pleased to see their daughter is happy. Meanwhile, over at the Institute, Ash remarks that Gengar was a tough opponent. Goh agrees, admitting that he hopes they’ll see it again as he still wants to catch it. It turns out Gengar isn't completely gone, rather it is seen standing atop the Institute's spire awaiting its next moment to strike.