It’s looking good for Ash as he works on his next three Gym Badges, but not so good for Dawn, coming off a pair of Contest defeats. Both will do what they can to become better Trainers, from entering the Wallace Cup competition to attending Professor Rowan’s Pokémon Summer Academy. Hopefully, the new tactics they pick up will give them the tools they need to succeed against the latest plot by Pokémon Hunter J—as well as the emerging threat of Team Galactic!
On the way to Veilstone City, Ash and the other decide to have a picnic. When Chimchar sees the happy environment, it seems confused since Paul never treated it this way.
On the way to Veilstone City, Ash and the others arrive in a town where the once again see Gardenia, the Eterna Gym Leader. Team Rocket also arrives in town. Gardenia asks Ash and friends to have a tag battle between her and James. Gardenia then tells James that he is not using Cacnea to its full potential, and offers to take Cacnea and help train it.
On the way to the next town, Ash and the others run into Zoey. She reveals that the new contest will be held in Solaceon Town. Ash and Dawn decide to start training. However, both Aipom and Buizel seem to be distracted by the training of the other trainer, so Zoey says that they should trade them.
On the way to Solaceon Town, Ash and Dawn are doing some late night training with their new Buizel and Aipom. During the battle, Buizel accidentally destroys a nearby stone tower, and unleashes the pok�mon Spiritomb. Spiritomb attacks them before flying away. The next morning Ash and the others arrive in a nearby village that was attacked by Spiritomb. They meet an old woman who tells them the tale of Spiritomb. After realizing the trouble they have caused, Ash, Dawn, and Brock decide to help seal Spiritomb away. Meanwhile Team Rocket disguise them selves as psychics in order to capture both Pikachu and Spiritomb.
As the others continue their travels, they come across some people who are set to build a new stone bridge. However, they are having problems with their employee: Bibarel, who doesn't want to work anymore.
On the way to the next town, Ash and the others meet a trainer who has a Nosepass. Ash asks to battle him and the trainer agrees. During the battle the trainer says he must go, as something regarding Nosepass' evolution is going to take place.
Ash and friends are lost while on the trip to Solaceon Town. They find a mansion nearby and decide to check it out. When they approach they are attacked by an young girl named Marble, her Luxray, and a bunch of security guards, who believe they are thieves. The owner comes out and the misunderstanding in resolved. The owner, Matthew, reveals that three criminals want to steal his treasure the Old Charm, at 8:00. Ash, Dawn, and Brock agree to help out. It turns out that Team Rocket are the thieves, and they make off with the treasure. Their plan ends abruptly when their balloon pops and crash lands in another part of the mansion. Everyone heads to get there, but Team Rocket falls prey to the mansion's traps. Now it is up to Ash, Dawn, Brock, and Marble to find Team Rocket and get the Old Charm back, but with a mansion full of traps and a disobedient Luxray, that may be harder then planned.
Ash and friends arrive in Solaceon Town for Dawn's next contest. Dawn is training and shows off Aipom's new move, Double Hit. Brock reveals that this means Aipom is close to evolving. Soon Kenny arrives and reveals his new Breloom. Ash wants to battle him, and Kenny agrees. During the battle Kenny shows off the move Energy Ball, which Ash immediately wants to teach Turtwig. Kenny agrees and the battle is called off to begin training. Meanwhile Team Galactic Commander Saturn as his two henchman arrive at the Sloaceon Ruins and retrieve a special cube, and before leaving, they upset all of the ruins' Unown. Ash, Dawn, Brock, and Kenny arrive at the ruins, and are then unexpectedly caught in the Unown's warped dimension and must figure out a way to stop them.
The day of the Solaceon Contest has finally arrived, and Dawn, Kenny, and Jessie are all determined to win. As the contest gets underway, all of them pull off dazzling appeals. When the final eight are selected, Dawn is not included. Dawn congratulates Kenny and Jessie. The final match comes down to Kenny and Jessie, and in a startling upset, Jessie defeats Kenny and wins her first ribbon. Kenny leaves town for the next destination that evening, while Dawn begins to sulk, trying to figure out why she keeps losing. The next day Zoey shows up and is ready to get Dawn back to winning form.
On the way to Veilstone City, Brock brings the group to the Mountain Hut Maid Café where they meet the owners, sisters Spring, Summer, and Autumn. The sisters show them how they produce the milk, which is where they learn that Autumn's Miltank, Ilta, does not like to listen. Brock agrees to help Autumn and Ilta, so Ash and Dawn decide to help Spring and Summer with the café in their absence. Brock then bestows all his breeding knowledge to help Autumn and Ilta get along and cooperate. Meanwhile, Team Rocket try to have their own café, but when that fails they decide to steal Ilta instead.
Continuing the journey to Veilstone City, Ash is busy training Turtwig so it can perfect Energy Ball. Realizing that it is getting late, Brock insists that they get to the next town before it gets dark. Dawn says that instead they should go to a nearby hot springs hotel owned by her friend's family. They arrive there and Dawn introduces them to her childhood friend Leona. While they immediately jump into the hot springs, they find out that the water level is low and they are cold. Leona reveals that it happened just recently, and her parents went off to find out the reason. Ash, Dawn, and Brock agree to help her find the reason and head up into the mountains with her. They soon discover a fresh hot spring in the mountains. The hot spring was made by a disguised Team Rocket, who is tapping into Leona's pipeline, and now they must find a way to get the water back.
Ash and friends stop to have lunch in a city while Ash continues to train Turtwig to master the move Energy Ball. They are suddenly interrupted by a group of Gligar and a Gliscor who swoop down on them and steal all of their food. While trying to decide what to do, Paul appears and scares the hoard off, revealing that he wants to capture Gliscor. Ash, Dawn, and Brock then run into Nurse Joy and Officer Jenny who reveal that Gliscor was trapped in the city due to recently strong winds, and its attempts at using sonar to escape attracted a group of Gligar. Ash, Dawn, and Brock agree to help them get the group of pok�mon back to the forest. Meanwhile, Team Rocket is planning a way to capture the pok�mon, while Paul plots on how to capture Gliscor, and Ash has a few encounters with a awkward Gligar.
Still on the way to Veilstone, Ash and friends stop by a sand-pit to have some fun. All of a sudden a Hippowdon emerges from underneath it. Trouble appears when the over curious Pachirisu falls into its mouth.
Ash & friends finally arrive at Veilstone City. In the forest outside the town, they witness a battle between a female martial-artist and a Lucario. The girl is revealed to be Maylene, Gym Leader of the city. Ash asks for a gym battle immediately, but Maylene isn't feeling up to it. Meanwhile, Ash and friends also meet someone unexpected.
Following Dawn's two contest losses, and Maylene's loss to Paul, both girls have lost their confidence in battle. The two of them decide to have a battle to regain their spirits.
Maylene has regained her confidence and accepts Ash challenge request. As the battle begins, Maylene begins with Machoke, while Ash chooses to use Staravia to show off its new training skills.
On the night before Ash, Dawn, and Brock leave Veilstone City, they stop at a park with some meteors. However, Team Galactic shows up and wants to take them.
While training with Gligar, Ash notices singing. When the group investigate, they find out it is coming from three Chingling. They are introduced to their trainer, who is trying to get the spoiled Chingling to have a better attitude.
On the way to the next town, Ash and friends encounter a Pokmon Ranger named Kellyn who is working undercover to protect a Riolu that can use Aura before it evolves from Pokmon Hunter J. Soon J returns, and she is not happy about seeing Ash again. Ash and friends agree to help the Ranger protect Riolu, but J is more persistent then ever.
J has managed to capture Riolu and delivers it to her client. In order to help get it back, Ash is reunited with his old Ranger friend Solana, and together they agree to save Riolu.
On the way to Pastoria City, Ash and friends encounter a Pokémon Ranger who is working undercover to protect a Riolu that can use Aura before it evolves from Pokémon Hunter J. Soon J returns, and she is not happy about seeing Ash again.
Ash and friends encounter a boy who has a Pichu and Raichu, and he thinks that Ash's Pikachu is wild. Meanwhile, Pikachu might have to revisit a very important issue regarding its future.
On the way to Pastoria City, Ash and friends have stopped at a pokémon center to do some training. On TV, Dawn watches Sinnoh Now which reveals the Wallace, the Hoenn Champion and a contest master, is in Sinnoh to host a special tournament. Dawn decides to train for the contest, but Zoey's advice gets to her and she begins to doubt herself again. Then Rhonda comes up to them says she is looking for Wallace, who is supposed to be nearby. Ash and friends decide to look for him, and near a lake they find him. He then invites them to come over, and when he finds out Dawn wants to enter the Wallace Cup, he asks to see some of her moves.
At a pier near Lake Valor, Ash, Dawn, and Brock wait for a ship to come which has their old friend May on it. The boat lands and they greet each other. As they leave the pier May talks about Max, reveals her new Glaceon and tells about her travels in Johto. When Ash gets hungry, she tells them she made reservations at the Seven Stars Restaurant. Once they get there, they find out they must win a tag battle before they can eat. Ash and Brock win their battle easily, but before Dawn and May can battle Team Rocket steals food from the restaurant and they decide to find them and get it backd Dawn.
The Wallace Cup is finally beginning and the competition is going to be fierce with Ash, Dawn, May, Zoey, and Jessie all competing for the prestigious Aqua Ribbon, which can be used in any region's Grand Festival. As the appeals start, May, Zoey, and Ash all put on great appeals, but Dawn is till nervous about her two previous failed contest bids and wonders if she really can make it past the appeals.
After everyone passes the first round of the Wallace Cup, the group returns to the lake resort to talk about their journeys. Ash and Pikachu head down to the lake where see a glow in the lake, and a shadow emerges and then disappears. Ash heads back to tell Dawn about it. The next day the contest resumes.
As the finals of the Wallace Cup begin, Dawn begins her first match. After winning, she must now battle May (who has defeated Zoey) for the Wallace Cup Ribbon!
The group meet a young boy who is chasing after a Yanma. They learn that he is a beginning trainer, just having started his journey. He tells them that he has been running after the Yanma for three days, but the Pokémon constantly escapes. Ash and his friends agree to help him make his first capture.
Ash and the others are running after Gligar who has been blown away by a gust, and run into Paul. After a huge argument about their different ways of treating Pokémon, Ash challenges Paul to a battle.
Ash and his friends have arrived in Pastoria City and head to the Gym. The Gym Leader Crasher Wake comes out but denies Ash's request for a Gym Battle because of an urgent matter. The group decides to accompany him instead and follow him.
The time has finally come for Ash's gym battle against Crasher Wake. However, the battle may prove more then Ash can handle with Buizel's latest attitude problem.
A Swinub constantly shows up at Mr. Backlot's mansion and eats away all the Poffins. Dawn tries to stop it by making her own Poffins for the Swinub.
Ash continues his training with Gligar, but finds out it has become fearful of battles since the battle against Paul's Gliscor. The group meets Gary again, and Ash asks Gary to help him solve the problem with Gligar, and Gary might have something that could change Gligar forever.
Ash and friends return to Hearthome City to challenge the Gym Leader who was gone during their last visit. However, they hear that the Gym Leader is still gone, making Ash unable to have his Gym Battle. The group meets an Idol Pokémon Stylist and her Lopunny. Upon seeing Dawn's Buneary, the woman suggests her to enter the Pokémon Collection, a famous fashion show.
While traveling through a deep valley, Ash and friends encounter a swarm of Psyduck in the middle of a road. Upon trying to pass them, the Psyduck suddenly start attacking them, and to make things worse, there are too many to battle. Trying to find away to get past them, they decide to try a figure out how to get around them.
Ash and friends have decided to participate in a Pokémon summer school. At this event, many trainers gather and spend time together for one week while learning various things about Pokémon. The trainers' first task is to choose a random Pokeball, raise/train the Pokémon contained and battle with it.
While continuing at the summer school, everyone's pokémon seems to be become hypnotized when they go near a lake. Ash and friends decide to investigate.
On the fifth day of Summer School, the trainers must learn how to behave correctly when handling Ghost pokémon. The trainers must team up with someone and find a special treasure in a nearby mountain. While there, Conway is attacked by the mysterious pokémon Dusknoir.
The end of Summer School has almost arrived and it's time for the final test. Trainers must chose a pokémon and use it to cross a forest, a lake, and eventually the finish line, but which team will reach the goal first?
When Piplup becomes over exhausted, Ash and friends must hurry to a pokémon center to treat it. Meanwhile, Team Rocket has been living a luxurious life style ever since the summer school ended. When they realize they are getting bigger, they decide to start a strict training regime.
On the way to Celestic Town, Ash and friends stop in a nearby town for Dawn to train. In town they meet up with Zoey who reveals that she lost in a battle to the Hearthome City Gym Leader Fantina, who is also in town. When Ash hears this, he immediately runs to find her, so he can challenge her.
On the way to Celestic Town, Ash and friends set up camp for the day. When Brock notices they are low on supplies, he heads into town to get more. Ash and Dawn believe running camp will be easy, but when Pachirisu gets sick things begin to get crazy.
Ash and friends have finally arrived in Celestic Town, which means it is finally time for Dawn to try and win her third ribbon. At the contest hall Dawn meets an older coordinator. Things heat up when she finds out that the woman is her mom's old contest rival! With the pressure building from this revelation, will Dawn pull off a win and earn her third ribbon?
Following Dawn's contest victory, Ash and friends decide to visit Celestic Town's museum before leaving. There they run into Cynthia and her grandmother. Then an middle-aged man shows up. Everyone heads into the museum where they see the mysterious Lustrous and Adamant orbs. Meanwhile, a sinister plot is unfolding as Team Galactic is gathering in Celestic Town.
Team Galactic launches a full scale attack on the Celestic Museum in hoped of obtaining both the Lustrous and Adamant orbs. The Galactic commanders surround the entire museum and are ready to fight. With the help of Cynthia, will Ash, Dawn, and Brock be able to stop Team Galactic from achieving their evil goal?
On the way back to Hearthome City, Ash and friends stop in Solaceon Town. After reading about a monster in a local paper, they decide to go searching for it. While looking they run into their Summer Academy friend Angie at her parents daycare center. There they discover that the monster in town is partially Angie's fault. They then agree to help her get the monster (which is really a Lickilicky) back before her parents get home.
On the way to Hearthome City, Ash and friends stop in a town where it turns out that Aaron of the Sinnoh Elite 4 is hosting a public practice session. They decide to watch, and then Aaron unexpectedly invites them to his training center. There they learn a little bit about Aaron and his pokémon. However, Team Rocket has plans to take Aaron's pokémon.
Ash and friends stop at a pokémon center so they can watch Cynthia's champion match on TV. Paul is also there. Ash and Paul quickly get into another argument which results in them having a battle. Paul uses his Honchkrow while Ash uses Turtwig. During the battle, Turtwig evolves into Grotle, and it immediately learns that it has lost its speed. Grotle must now figure out a way to deal with its lose of speed.
Ash and friends finally arrive back in Hearthome City so that Ash can have his rematch with Hearthome City Gym Leader Fantina. On the way to the gym a trainer runs into him. He quickly runs off, leaving his badge case on the ground. As he can't have his battle with Fantina just yet, he tries to find the owner. In the park he again runs into Barry, the trainer the case belongs too. Barry reveals that he knows about Ash from the Tag Team Tournament. He then starts talking about how he idolizes Paul and wants his pokémon to be just like Paul's. Ash is upset with this, and challenges him to a battle. However, first Barry must go get his pokémon from a pokémon stand where some people watch your pokémon. However, it turns out to be just a scam by Team Rocket. After that is taken care of, Ash and Barry begin their battle.
The time has finally come for Ash's rematch against Hearthome City Gym Leader Fantina. The battle will be a three-on-three battle with Gengar and Buizel as the first match-up. Will Ash be able to overcome Fantina's powerful Ghost-type Pokémon and win his 5th Badge?
Ash and friends take a blimp to Canalave City, home of the next Sinnoh Gym. Once they land, however, Team Rocket's latest scheme backfires and everyone's Pokémon blast off and are scattered throughout the city. Now Ash and friends must find their Pokémon before Jessie and James do.
Ash heads to the Canalave Gym for a battle, but the Gym Leader is not there, and all of his pupils are fast asleep. After bumping into Officer Jenny, they find out that a bunch of people in town are having nightmares. They decide to help find the source, and it leads to Team Rocket. They have created a machine that gives everyone nightmares, and thus makes the citizens want to buy what they believe to be real Lunar Wings. Ash, Dawn, Brock, and Jenny manage to destroy the machine, but that night they still have nightmares. With no other option they head to Newmoon Island to find the legendary Cresselia, hoping she can help.