Xiaoyun set out with Dawn, chose Turtwig, and helped rescue Pikachu from Team Rocket before meeting Ash and Paul. After Paul challenged Xiaoyun, Sceptile defeated Torterra, and Paul left planning to prepare for their next battle.
Xiaoyun and Dawn traveled to Jubilife City, where Dawn caught Buneary, trained Piplup, and reached the final of her first Contest before losing to Zoey. The group then went to Oreburgh, where Ash lost to Roark and Xiaoyun joined the effort to control rampaging fossil Pokémon, leaving him facing Aerodactyl with Ursaring.
Xiaoyun won the Coal Badge, helped Dawn prepare for and win the Floaroma Contest, and rescued Meijia’s Gardevoir from Hunter J. After defeating and catching Suicune, he left the Legendary Pokémon at the remote Pokémon Center with Xiaowu as he and Dawn continued toward the Eterna Gym.
Xiaoyun won a series of battles, earned his second Gym Badge, and traveled with Dawn and their friends to Alamos Town. When Dialga and Palkia’s clash pulled the town into another dimension, Xiaoyun joined Darkrai in fighting them and left the battle underway.
Xiaoyun took Darkrai and Mismagius as partners, stopped Hunter J from escaping with Shieldon, and helped Dawn prepare for the Hearthome Contest. Dawn reached the final against Nando, where Piplup faced Sunflora after Buneary and Anorith were knocked out.
Xiaoyun won the Hearthome Gym battle, then teamed with Dawn to claim the Double Battle Tournament title. After Paul abandoned Chimchar, Xiaoyun took him in and helped him master his power in the final, leaving Paul to walk away in silence.
Xiaoyun and Dawn faced Spiritomb, Team Rocket, and Team Galactic while Dawn struggled through a contest loss and grew closer to Xiaoyun. The pair reached Tang Hong’s hot spring inn, where they battled together before relaxing in the springs.
Xiaoyun and Dawn helped Trapinch return home, then Xiaoyun restored Maylene’s confidence and defeated her for the Cobble Badge. After confronting Team Galactic in Veilstone, Xiaoyun protected Riolu from Hunter J and Terashima’s poachers and fought to free it.
Xiaoyun rescued Riolu, joined Dawn at the Wallace Cup, and continued his Gym challenge while Dawn won the contest. After catching Skorupi in the Great Marsh, Xiaoyun and Dawn entered Paris’s Fashion Design Competition, where Dawn and Lopunny took first place.
Xiaoyun and Dawn faced ghostly danger at the Old Chateau, bonded during Professor Rowan’s camp, and helped stop Team Galactic from stealing the Lustrous Orb. Later, they joined Ash’s group to protect Shaymin and Giratina from Zero, leaving the Distortion World threatened by a broken ice pillar.
Xiaoyun and his companions resolved Canalave City’s Darkrai crisis, earned the Mine Badge, and uncovered Team Galactic’s plan on Iron Island. After reaching Snowpoint City, Xiaoyun won the Icicle Badge while Ash defeated Candice, and the story ended with news that Deoxys had infected Sceptile with a virus.
Xiaoyun earned Brandon’s Brave Badge, caught Gible, and confessed his love to Dawn before Team Galactic’s attack on the Lake Guardians drew him into a battle at Spear Pillar. Cyrus’s plan collapsed when Giratina pulled Dialga and Palkia into the Distortion World, but Hunter J’s escape left a new threat in play.
Xiaoyun and Dawn confronted Arceus, traveled to ancient Michina and then Hisui, before returning to Sinnoh for the Lake Valor Grand Festival. Dawn advanced through the contest rounds to face Zoey in the final.
Xiaoyun entered the Lily of the Valley Conference, advanced through the tournament, and defeated Paul in a hard-fought quarterfinal. In the semifinal against Ash, the battle remained undecided as Ash Mega Evolved Charizard and Xiaoyun activated Sceptile’s Curse Mark Mode.
Xiaoyun won the Sinnoh Conference and defeated Cynthia, then traveled with Dawn to Unova, where they faced new challenges and began their journey through the region. The stretch ended with Xiaoyun’s newly evolved Gabite continuing a six-on-six battle against Trip.
Xiaoyun and Dawn won Gym battles, confronted Team Plasma and rival hunters, and continued their journey through Unova. After the tournament brought them through its elimination rounds, they advanced to face each other in the final, with Champion Alder offering the winner a challenge.
Xiaoyun and Dawn traveled through Unova, winning festival and Gym battles while becoming entangled in the conflicts surrounding Victini and the Forces of Nature. They reached Mistralton City, where Skyla judged them defeated in simulated Air Battles, but Rotom challenged her assessment.
Xiaoyun and Dawn won tournaments and Gym Badges while their Pokémon evolved, then helped Keldeo pass Kyurem’s trial and gained the DNA Wedge. They reached Virbank City, where Dawn earned her eighth Badge and Xiaoyun’s battle with Roxie continued.
Xiaoyun earned his final Unova Badges, befriended Deino, and faced Team Rocket’s attempt to capture Mewtwo before reaching the Vertress Conference. The arc ended as Xiaoyun and Trip began their preliminary battle with matching Serperior.
Xiaoyun and Dawn advanced through the Vertress Conference quarterfinals and semifinals, leaving Xiaoyun and Ash to battle for the championship. Ash gained the advantage in the final, with Mega Charizard X facing Xiaoyun’s Metagross.