Dawn's latest training session is interrupted by a Glameow and Misdreavus that seem to be asking for help, and it's a safe bet that those Pokémon must belong to Zoey! Sure enough, the two Pokémon lead Dawn and her friends to Zoey, who's fallen and sprained her foot. Our heroes treat the sprain the best they can and help Zoey back to her campsite, where everyone is introduced to Zoey's new Shellos. That's when Zoey tells Dawn that the upcoming Hearthome Contest has a double performance format, which means Dawn has to show off two Pokémon at once!
Fortunately, Zoey offers to help Dawn train. First, she shows Dawn some of the combinations she has planned for Glameow and Shellos. Then Dawn tries to develop some combinations of her own with Pachirisu and Piplup, but it's even harder than she imagined. Things aren't any smoother when she tries a double battle with Buizel and Buneary against Pikachu and Aipom, but all Dawn can do is practice until her team gets it right.
Jessie, now disguised as Jessilina the Coordinator, drops in for a surprise visit and challenges Dawn to a double battle. Zoey's not about to let Jessilina pick on a double battle novice, so she accepts the challenge instead! Injured or not, Zoey still has all her skills intact—her Glameow and Shellos overcome Jessie's Dustox and Seviper with power and style. Zoey's example encourages Dawn to keep on trying, and the two Coordinators look forward to their next meeting at the Hearthome Contest!
Dawn is training in the woods with Piplup, when Zoey's Glameow and Misdreavus find them while searching for help for their Trainer. Zoey sprained her ankle while training, and is forced off her feet while she recovers. Brock gives her some first aid, but she needs to get to a Pokémon Center for full healing. They head to her camp and Zoey shows off her new Shellos, caught exactly where Dawn caught her Buizel. When Ash and Pikachu try to introduce themselves to Shellos, it gets very scared. Dawn lets her Buizel out, and it starts to stare at Shellos, making it even more frightened. Piplup starts arguing with Buizel until Dawn breaks them apart.
Seeing how poorly Buizel and Piplup are getting along, Zoey decides to demonstrate to Dawn the theme of the upcoming Hearthome Contest, appeals involving two of the Coordinator's Pokémon instead of one. Zoey gets her laptop and shows Dawn and her friends a video of Top Coordinator Marina delivering a Double Performance using her Wani-Wani and Pink. Zoey tries to help Dawn by showing her a combination with her Glameow and her Shellos. First Zoey has Shellos firing a Mud Bomb into the air, which Glameow used Shock Wave on, dotting up Shellos's attack. Shellos uses Hidden Power to destroy the Mud Bombs, which results in a beautiful and flashy fireworks display. Zoey informs Dawn that there are many factors that create a great performance including the type of Seals used and finishing poses.
Dawn decides to practice a bit for the Double Performance, pairing Piplup with Pachirisu and Buizel with Buneary. She tries Pachirisu’s Sweet Kiss followed by Piplup using Whirlpool. Unfortunately the Whirlpool covers up the hearts from the Sweet Kiss. She tells Pachirisu to use Discharge on the Whirlpool, but this combination fails too and it ends up zapping both Dawn and her Piplup. Dawn tries the combination for a second time, but it fails again as Pachirisu's Discharge was too powerful.
Dawn is feeling really bad, so Ash challenges her to a practice Contest Battle while she comes up with some new combinations. Ash decides to go with his Pikachu and Aipom, while Dawn chooses her Buneary and Buizel. Ash starts off first by telling Aipom to use Swift before having Pikachu jump into the attack with Quick Attack. Dawn notices that Aipom is left wide open, and she tells her Pokémon to dodge Pikachu's attack. She has Buizel use Aqua Jet while Buneary encases him in an Ice Beam, creating an Ice Aqua Jet. However, Buizel is frozen solid and hits the ground hard before falling into the nearby river along with Aipom. Dawn is momentarily distracted by the accident, but Zoey reminds her that she is still in a match. Dawn complies, having Buizel use SonicBoom, striking Aipom out of the water. Aipom builds up its Focus Punch. Meanwhile, Pikachu aims a Thunderbolt on the ground, sending debris at Buizel and Buneary. Dawn tries to tell Buneary to intercept Aipom's Focus Punch with Ice Beam, but Aipom is protected by the rocks and lands a direct hit on Buneary, knocking her down. Pikachu uses Volt Tackle, overpowering Buizel and its counter Aqua Jet, to win the match for Ash.
Dawn feels bad because her Ice Aqua Jet combination didn't work very well. After some encouragement from her Pokémon she tries the combination once again, but it fails once more. Jessilina comes along, hoping to challenge Dawn while she's still faltering. However, Zoey decides to accept instead, despite her foot not fully healed. Jessie selects her Dustox and Seviper for the match. First, Dustox aims a Poison Sting towards the sky, before Seviper hits the projectiles with Poison Tail making them spin, adding lots more speed and power to them. But Zoey turns her opponent’s combination into her own advantage, having Glameow use Iron Tail and Shellos uses Mud Bomb to destroy the stings and leave a beautiful purple sparkle behind. Dustox uses Psybeam, but Zoey's Pokémon dodge the attack. Glameow fires back with Shadow Claw and Shellos uses Blizzard on the Shadow Claw for a combination attack which manages to knock both Jessie and her Pokémon back. Team Rocket decides to retreat after that.
Later, the group takes Zoey to the nearest Pokémon Center, and they all agree to meet up at the Hearthome Contest. Zoey wishes Dawn all the best with her Ice Aqua Jet combo, which gives Dawn a rise in confidence for the next rival clash.