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, being awarded with a lei of flowers. Sophocles and Kuwashi prove to be an even match, both answering nine questions correctly. The host gives the final question for the preliminary round, and Sophocles eventually loses to Kuwashi.
Backstage, the group comforts Sophocles and Togedemaru after their loss. Rotom then notices 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. When Ash is confused, his classmates explain that Koi-chan is a child actor prodigy famous for the hit TV show "A Tiny Koiking's Melody". Rotom takes some photos before Koi-chan's manager orders him off the set. The TV crew begins shooting a scene of Koi-chan's Yungoos friend leaving, but Koi-chan's voice suddenly becomes too hoarse, and its body eventually starts glowing, prompting Koi-chan's manager to take it off the set for a rest.
When George is about to leave for a shoot, Rinka and Kenichi run up and inform him that the lead actors for "ThreeDri" cannot show up to set because of a Blizzard whipped up by a Froslass and Abomasnow, which is preventing the actors' plane from leaving the Sinnoh region. George then spots Lana, Lillie, and Mallow; and decides that they will star in the show alongside their Pokémon. They all agree, though Lillie is worried about her limited acting experience. George takes the three girls over to the studio for their rehearsals. Meanwhile, the manager returns Koi-chan to the set and filming resumes. The scene initially goes well, but Koi-chan suddenly begins glowing again and then evolves into a Gyarados. The manager approaches Koi-chan and tries to calm it, but it flees with the manager, Ash, and his remaining friends in pursuit.
Elsewhere, Meowth and James prepares Jessie, as her alter ego Musabarbara, for an upcoming audition of a drama commemorating the 55th anniversary of Alola TV. In a rehearsal studio nearby, George tells the girls about their starring roles in "ThreeDri", short for "The Sparkling Trio is Alola DrinKyun", in which three girls protect the peace of Alola and use a drink to transform into their superhero selves. He then hands each of them a script, but the trio bungles the superheroes' main catchphrase. George assures them that they did well, and with a little more practice, they will perform better.
As 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 pats 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.
