The television host announces the beginning of the Alola Pokémon Quiz, with the first to buzz in having the chance to answer the question. Ash and his classmates watch from the audience as Sophocles competes in the show. Kuwashi is also competing and quickly answers the first question correctly. A Comfey awards him a lei of flowers. Sophocles and Kuwashi prove to be an even match, both answering nine questions correctly. The host poses the final question for the preliminary round, though Sophocles is later revealed to have lost the quiz show to Kuwashi.
Now backstage, the group comforts Sophocles and Togedemaru after their loss. Rotom then notices a familiar face, George Charino, the producer who works on the television series Alolan Detective Laki. Charino invites the group to see the filming of an upcoming drama, and they all agree. They walk outside and notice a gathering crowd up ahead. Sophocles and his friends make their way to the front of the crowd and are left speechless when they see Koi-chan. Ash doesn't understand why everyone is excited over the Magikarp. His friends explain that Koi-chan is a child actor prodigy and famous for the hit TV show "A Tiny Koiking's Melody". Kiawe appears to know a lot about the series, and he admits that his younger sister is a big fan of Koi-chan. Kiawe whispers to Rotom and requests a few pictures of Koi-chan for Mimo, and Rotom takes some photos before Koi-chan's manager orders Rotom off the set. The TV crew begin shooting a scene and urge the audience to be quiet. The Director informs Koi-chan about the scene, its friend Yungoos is leaving, before filming begins. On the first try Koi-chan's voice is too hoarse, and on the second its body begins to glow. Several more cuts, but Koi-chan's voice has drastically changed and is no longer sweet sounding. Koi-chan's Manager takes the superstar away from the set for a moments rest.
George tells the group that he has a shoot to get to, but as he is about to leave Rinka and Kenichi rush over to inform him that the lead actors for "ThreeDri" cannot show up to set. Kenichi explains that a Froslass and Abomasnow whipped up a Blizzard that is preventing the lead actors' plane from leaving the Sinnoh region. George proudly announces that moments of trouble are great opportunity to create something new. He soon spies Lana, Lillie and Mallow, and decides that they will star in the show alongside their Pokémon. Lana and Mallow are keen, and while Lillie is worried about her limited acting experience she also agrees. Soon George takes the three girls over to the studio for their rehearsals. The boys are surprised at George's bold decision, and Ash cries out that he wants to be a TV star.
Koi-chan's Manager returns Koi-chan to the set, and the Producer asks the crowd to be quiet as filming resumes. The scene appears to be going well, as Koi-chan's voice is no longer sounding hoarse. Though Kiawe and the others watch as Koi-chan glows and evolves into a Gyarados. The crowd, except for Ash and his friends, flee the film spot while the film crew are a gasp from Koi-chan's surprise evolution. The Manager approaches the film star and tries to settle it, but Koi-chan rushes away. She as well as Ash and his friends run after Koi-chan. The Producer soon declares the shoot cancelled.
Meanwhile, Meowth and James prepares Jessie, as her alter ego Musabarbara, for an upcoming audition for the 12 hour drama being filmed to commemorate the 55th anniversary of Alola TV. Team Rocket are a little concerned by the competition, several flexing Fighting Pokémon. Though Jessie enters her audition in a confident and graceful manner, declaring it her Alolan debut. In a rehearsal studio, George Charino informs the girls about their starring roles in "ThreeDri". He explains that "ThreeDri" is short for "The Sparkling Trio is Alola DrinKyun", but Lana and the others don’t recognize the title. Charino explains the series' main plot; three girls protect the peace of Alola and use a drink to transform into their superhero selves. He then hands them each a script, and as the trio performs the superheroes main catch phrase, it proves to be a shaky start. George assures them that they did well, and with a little more practice they will perform better.
Koi-chan continues its rampage. Ash confronts the Manager with some questions, and she admits that she did notice that Koi-chan's whiskers appeared to be longer recently. Koi-chan charges through Anna's latest shoot, leaving her in a cloud of dust, before entering the Alola TV studio building. Koi-chan crashes through the filming of an Alola Pokémon Quiz final round episode and interrupts the girls' "ThreeDri" rehearsals. Koi-chan spots George and instantly begins flailing around, and George then realizes that the Gyarados is actually Koi-chan. George calmly parts Koi-chan on its head, and reassures it that everything should be fine. He announces that there is still some time for filming and asks for everyone's assistance. George's ingenuity is later showcased in the latest episode of "The Sparkling Trio is Alola DrinKyun".
Later, Ash and his classmates have gather at Professor Kukui's home to watch Lillie, Lana and Mallow's acting debuts in "The Sparkling Trio is Alola DrinKyun". The episode begins with Mallow rushing to her two friends, played by Lillie and Lana, where the trio are going to be late for class. The three girls notice holes in the main path way when suddenly the Gyarados Devil, played by Koi-chan, crashes down in front of them. Gyarados Devil roars at the trio, so the girls decide to take action. Mallow calls over their companions, and soon Sandy, Shaymin, and Snowy appear carrying drinks for the trio. The girls promptly take a sip and transform into their DrinKyum alter egos in a dazzling display of lights and sparkles. Mallow becomes the pink Tea DrinKyum, Lillie transforms into the blue dress wearing Soda DrinKyum and Lana takes the role of the citrus yellow Juice DrinKyun. The three DrinKyun heroes go on to defeat Gyarados Devil with a powerful rainbow-beamed Alola Salute Sunday Sunrise attack. The episode ends with the superheroes posing while the narrator asks if they will be able to make it to class on time. Ash and the other boys are impressed by their friends' performances and congratulate the girls on their great acting.
Meanwhile, George proudly announces that Koi-chan will still have a future in TV as a villain star. He and the Manager watch the ongoing filming where Team Rocket are fleeing from a rampaging three-headed Gyarados monster. Jessie is annoyed that her Alola debut is so demanding, but Meowth is quick to remind her that she said she was prepared to do anything during her audition. James then questions why he and the others are in the film.