Dawn makes her second attempt to capture a Buneary. She pulls out a Poké Ball, but Ash reminds her to make it larger. She expands the ball and throws it, but it slips and hits Ash in the face. Ash gets angry and scolds Dawn, and an argument ensues. Buneary slips away, and Piplup notices, alerting everyone else. Ash and Dawn continue to argue as they continue down the path. Brock tries to stop them, but bright sunlight silences all three of them. Brock mentions that it is Sunny Day. A Budew walks up and Ash checks his Pokédex. A minstrel steps out from behind a tree, playing a harp and mentioning that the move helped calm the argument. The group exchanges introductions, the man identifying himself as Nando and his Budew. Dawn asks Nando for a battle in order to show Ash how strong she is. Nando asks her if she is going for the Sinnoh League, her reply being that she is going for the Sinnoh Grand Festival. Nando decides to make it a Contest battle as they head to a clearing. Team Rocket follows and notices Dawn with Ash and Brock, Jessie irritated that she is going for the Grand Festival.
Dawn chooses Piplup to go against Budew. Dawn goes first with Peck, but Nando’s Budew dodges easily, jumping up in the air and firing Bullet Seed. Piplup dodges and fires BubbleBeam. It hits, but it is ineffective against Budew. Ash points out the type disadvantage while Brock notices that Budew used the smoke as an appeal. Nando orders Budew to use SolarBeam and Dawn decides to rush Piplup in with Peck. However, Sunny Day was still in effect, something she overlooked, and SolarBeam fires immediately, scoring a hit and incapacitating Piplup. Nando commends Dawn for her first battle as he departs. Team Rocket watches and Jessie snubs Dawn for her loss, they group planning to steal Pikachu.
As sunset passes, Dawn sulks at her loss and her inability to catch Pokémon. Brock looks at his guidebook and mentions a nearby Pokémon Center, where they can stay the night. Brock brings out Bonsly as Dawn checks her Pokédex. Ash asks if Brock brought his other Pokémon, but Bonsly is his only Pokémon, his other Pokémon back at home. Dawn learns that Brock was the Pewter Gym Leader.
At the center, Dawn thinks the Nurse Joy there was the same one from Sandgem Town. Brock shows how all the Nurse Joys are related as he makes his romantic advances, Dawn noticing the familiar behavior. Dawn calls her mother as she thanks them for watching her. Nurse Joy comes up and asks Ash if he already registered for the Sinnoh League, which he has not. She takes his Pokédex and plugs into a computer, registering him. Dawn asks if she can register for contests as well, but Joy mentions that she does that at the Contest Hall, as well as getting a Contest Pass. Three Trainers arrive with the three Sinnoh starters, one with a Prinplup. Dawn checks her Pokédex as Nando shows up. Nurse Joy hands Nando his Budew as Nando takes off to ponder a decision. Nurse Joy reveals to Ash and his friends that Nando is trying to decide whether to focus on winning badges or contests. Ash and Dawn argue about what Nando should choose, running off after Nando to ask, forcing Brock to follow.
Night falls as Ash and Dawn lose Nando. Ash's Starly did not find Nando as he recalls Starly. Ash mentions that the group will have to camp out for the night as Brock scolds them for being impulsive. A disguised Team Rocket shows up and points them to a building in the forest where they can stay. The wind blows and the building, which was really a large, propped board, falls over and removes Team Rocket's disguise. They recite their motto as James brings out Carnivine. Noting the new Pokémon, Ash checks his Pokédex. Dawn brings out Piplup and fires BubbleBeam, but Carnivine literally eats it and charges forward with Bite. However, Budew intercepts, pushing Carnivine back and fires Bullet Seed, sending Team Rocket flying. Nando shows up as Ash and Dawn try to persuade him to focus specifically on either Contests or Gym battles. Ash and Dawn continue to argue as Nando stops them, mentioning that they can hear the forest sounds and wild Pokémon roaming. The group stops and listens at the various Pokémon. Dawn apologizes to Ash for her anger and the two make up. Ash mentions the time when he first spotted Ho-Oh at the beginning of his journey. Dawn mentions her sighting of a projected soul of a legendary Pokémon back at Lake Verity.
Ash asks Nando to battle, which happens the next day, pitting Pikachu against Budew. Pikachu uses Quick Attack on Budew, but it fires Bullet Seed. Pikachu dodges and hits with Quick Attack. Budew uses Mega Drain, ensnaring Pikachu and sending it flying, taking energy and healing Budew. Pikachu gets up and uses Thunderbolt, shocking Budew. Budew gets up and glows, evolving into Roselia. Ash is shocked by Budew's evolution. Roselia uses Sunny Day to amplify the rays and proceeds to complete the combo with SolarBeam. Pikachu darts forward as the beam launches. Pikachu jumps up to dodge and comes down with Iron Tail, knocking out Roselia. Nando picks up Roselia and recalls it. He thanks Ash and Dawn, announcing his decision to do both Contests and Gym battles based on his battles with Ash and Dawn. The group parts way and Ash's group continues on to Jubilife City.