A Bonsly is seen sobbing during the night. Tears roll down its face. The next day Ash and co. have stopped for a lunch break. May, who is rubbing her egg, hopes her egg will hatch soon. Brock tells May that it won't be for long since she has had the egg for a while now. Max says that it could be any kind of Pokémon. Ash gets up and decides to work more with Pikachu on its Volt Tackle attack.

Ash has sent out Donphan. Donphan's job is to battle Pikachu. Pikachu charges at Donphan with a powerful Volt Tackle. The attack hits Donphan, but Donphan manages to send Pikachu backwards. Ash tells Donphan that it is the perfect training partner for Pikachu. Donphan happily stomps its feet on the ground. Brock, May, and Max also notice the strength Donphan has. Suddenly, Donphan roars and uses Rollout straight at Ash. Ash and Pikachu dodge Donphan's attack. Donphan destroys a rock. A ninja and his Ninjask fall against a tree. A bit later, the ninja explains to Ash and co. why he was spying on them. Apparently there have been some thieves around, and he was making sure that Ash and co. weren't the thieves. Ash forgives the ninja. Ash and his friends introduce themselves to the ninja. Then the ninja introduces himself. His name is Evian, a trainer at a ninja school. A ninja school is where you do ninja training but with Pokémon. Evian offers them to be students for one day. Ash, Brock, May, and Max think that it is a great idea.

At the training camp, a girl who appears to be the leader announces that there have been some strange things going around. Her students all say that they had something stolen from them. Brock begins to get love crazy again over the girl, however he is shocked when he finds himself talking to a stick. The girl explains that her ninja skills are superior.

Team Rocket is watching the group from behind the trees. Jessie wants to capture Pikachu and bring it to the boss. James reminds Jessie about the ninjas and how rough they are. Jessie laughs at James's words. She tells James that she was a ninja girl back in her early years. James and Meowth start to ignore Jessie. Jessie gets mad at them for not paying attention to her story.

The ninja's first test is to stay underwater while breathing through a straw. Everyone manages to keep themselves underwater for a good amount of time. A few minutes later, no one can hold their breath any longer, so they surface above the water. The girl tells her students that in order to succeed the task they must believe that they are the water. Their next test is camouflage. Everyone is in camouflage. Max is has tarp that looks exactly like a tree and is hiding behind it. Ash and Pikachu hide under a blanket. Three Pidgey fly down and start to peck at the blanket. Ash reveals himself to the opening because it was too hot under the blanket. The girl sees that they need to work more on their endurance.

The girl sends out a Kecleon. What the students have to do is work with their partner to find Kecleon. Kecleon disappears and runs off. Ash and Evian walk around together looking for Kecleon. It's a hard task to find Kecleon. Evian stops and holds up two fingers. He thinks for a moment and points to the trees. Ninjask uses Sand-Attack which reveals Kecleon's tail. However before Evian can catch Kecleon, Kecleon disappears again. The girl walks up to Evian. She congratulates him for almost catching Kecleon. Ash tries Evian's strategy now. He senses that Kecleon is in a different part of the trees. Pikachu uses Thunderbolt, but barely misses. Kecleon grabs on to Ash's hat and runs up a tree. Ash and Pikachu leap out to grab Kecleon, but they miss.

The other students look for Kecleon. One boy peers through the grass and he finds a Bonsly. He quickly picks the Bonsly up. He notices that it is the same Pokémon that has been stealing from them. The Bonsly begins to cry. Brock takes the Bonsly out of the boy's arms. Ash, Evian, and the girl come up. Ash looks up Bonsly in his Pokédex. The girl and two boys tells Brock that the Bonsly stole from them. Brock asks them if they have any proof that Bonsly stole from them. He picks up an Oran Berry and holds it out to Bonsly. Bonsly looks at the Oran Berry and knocks it out of Brock's hand. Brock prepares a bottle of milk for Bonsly and gives the milk to it. When Bonsly is done sipping from the bottle, it begins to attack Brock for a strange reason. Suddenly, a ninja star is thrown at the group and a rose is revealed. Team Rocket comes out in a ninja suit. They say their motto. With their robot machine, the machine spits out spider webs out to the group. The Pokémon are caught in the web and begin to be pulled to Team Rocket. Then Team Rocket begins to float away.

The girl sends out Shiftry. Shiftry jumps into the sky and hits Team Rocket's robot, taking it down. Then Ash sends out Grovyle, May sends out Combusken, and Brock sends out Marshtomp. Grovyle uses Leaf Blade to cut the spider web. All the Pokémon trapped are now free. Now that the Pokémon are free from Team Rocket, Shiftry uses Rock Smash. The powerful attack causes a small earthquake below Team Rocket. Combusken uses Fire Spin to burn Team Rocket. Then Marshtomp fires a Water Gun at Team Rocket causing to fall from the tree to the ground.

Jessie gets up. She offers a ninja-to-ninja challenge with the girl. The girl accepts Jessie's challenge. Jessie sends out Seviper which uses Haze attack. Then Jessie jumps in the air. It looks like she is flying, however she is actually on a rope pulled from James and Meowth. Jessie has a net in her hands. She releases it on the ground hoping to catch the girl. Unfortunately for Jessie, the girl is actually safe and Jessie caught the stick instead. Jessie uses her Double Team technique even though the other two Jessies are James and Meowth. The girl, embarrassed, has Shiftry use its own Double Team. Then Shiftry uses Razor Wind which traps Team Rocket in a cyclone. Ninjask scratches Team Rocket with Fury Swipes and Ariados traps Team Rocket in a spider web. Brock asks Team Rocket if they were the ones who stole the Oran berries. Team Rocket says they did. They roll away down a cliff, and they blast off again.

The girl thanks Ash and his friends for saving their Pokémon. Bonsly begins to cry again. May thinks that Bonsly has grown to be fond of Brock. Brock asks Bonsly if it wants to travel with him. Bonsly jumps into Brock's arms and moves rapidly. Brock wonders what Bonsly is trying to do. Ash thinks for a moment and understands that Bonsly wants to battle with Brock. Brock agrees to battle Bonsly.

Brock has his Forretress battle Bonsly. Bonsly starts the battle with Fake Tears. However, Brock thinks that Bonsly is really crying. Brock is fooled when Bonsly strikes Forretress. Forretress uses Rapid Spin and ignores Bonsly's crying. The attack directly hits Bonsly. Bonsly begins to spin, but Forretress uses Spikes to stop it from spinning. Brock throws a Pokéball at Bonsly. The ball shakes for a bit. Bonsly breaks free. However, Bonsly trips and falls on a spike. Bonsly yells in pain. Brock throws another Pokéball at Bonsly. This time Bonsly is successfully captured.

Brock prepares a bottle of milk for Bonsly. Bonsly happpily drinks the milk. Then it throws the bottle at Brock and cries. Brock scolds at Bonsly, but Bonsly was just using Fake Tears. Now that Brock has Bonsly everyone makes fun of the fact that Brock has turned into a father. Now Ash and co. continue their journey to the Battle Pike.

English Official Summary

Ash takes a break to train with Donphan and Pikachu, and Donphan uncovers a young ninja named Evian. He's from the Pokémon Ninja School, where Trainers and their Pokémon study the ninja arts together, and he thought Ash and his friends might be behind a recent rash of strange events and robberies. After he apologizes, our heroes enroll in the school for day and try out ninja techniques with their teacher, Angela. Team Rocket secretly watches and waits—Jessie has big ninja dreams of her own! Angela has everyone try to find her Kecleon, which is easier said than done for Ash. During the exercise, the students find a Bonsly and blame it for the thefts. Brock calms the crying Bonsly down and proves its innocence. The real thieves are Team Rocket, who swoop in to steal the students' Pokémon but are clearly outmatched. Jessie, never one to give up, still challenges Angela to a ninja battle and the real ninja easily wins. Then it's time for everyone to send Team Rocket bouncing on their way again. With Team Rocket gone, Bonsly wants a battle with Brock. Brock sends out Forretress and uses Spikes to weaken Bonsly so he can capture it. Now he has a new Pokémon! A baby Pokémon! Who needs lots of attention and care... is Brock really ready to be a "father"? Our heroes continue on their way to the Battle Pike with their newest, youngest team member!

French Official Summary

Sacha fait une halte pour s'entraîner avec Donphan et Pikachu, et Donphan découvre un jeune ninja appelé Florent.

German Official Summary

Ash trainiert mit Donphan und Pikachu. Da entdeckt Donphan einen jungen Ninja namens Evian.

Italian Official Summary

Ash si concede una pausa per allenarsi con Pikachu e Donphan, che scopre un giovane studente, di nome Evian, della scuola per ninja e Pokémon.

Portuguese Official Summary

A caminho do Pico da Batalha, nossos heróis encontram uma escola Pokémon ninja, onde eles ajudam os alunos a salvar seus Pokémon das garras da Equipe Rocket.

Finnish Official Summary

Matkalla kohti Ottelukeihästä sankarimme löytävät Pokémon-ninjakoulun, jossa he auttavat oppilaita pelastamaan Pokémoninsa Rakettiryhmän kynsistä.

Spanish Latin America Official Summary

En su camino hacia el Pico de Batalla, nuestros héroes se encuentran con una escuela ninja Pokémon, donde ayudan a los estudiantes a rescatar a sus Pokémon de las garras del Equipo Rocket.

Spanish Official Summary

Ash se toma un descanso para entrenar con Donphan y Pikachu, y Donphan descubre un joven ninja llamado Evian.

English Great Britian Official Summary

Ash takes a break to train with Donphan and Pikachu, and Donphan uncovers a young ninja named Evian. He's from the Pokémon Ninja School, where Trainers and their Pokémon study the ninja arts together, and he thought Ash and his friends might be behind a recent rash of strange events and robberies. After he apologizes, our heroes enroll in the school for day and try out ninja techniques with their teacher, Angela. Team Rocket secretly watches and waits—Jessie has big ninja dreams of her own! Angela has everyone try to find her Kecleon, which is easier said than done for Ash. During the exercise, the students find a Bonsly and blame it for the thefts. Brock calms the crying Bonsly down and proves its innocence. The real thieves are Team Rocket, who swoop in to steal the students' Pokémon but are clearly outmatched. Jessie, never one to give up, still challenges Angela to a ninja battle and the real ninja easily wins. Then it's time for everyone to send Team Rocket bouncing on their way again. With Team Rocket gone, Bonsly wants a battle with Brock. Brock sends out Forretress and uses Spikes to weaken Bonsly so he can capture it. Now he has a new Pokémon! A baby Pokémon! Who needs lots of attention and care... is Brock really ready to be a "father"? Our heroes continue on their way to the Battle Pike with their newest, youngest team member!

Russian Official Summary

Во время тренировки Эша с Пикачу и Донфэном, наши герои знакомятся с учеником местной школы ниндзя, Эвианом, который за ними следит. Ученики школы сообщают о ворах, орудующих в округе, и пытающихся украсть их ягоды Оран. По ошибке наших героев принимают за воров. Поняв свою ошибку, они начинают подозревать юного Бонслая, которого замечали поблизости. Появляется Команда Р, которая пытается украсть покемонов учеников. Позже выясняется, что именно Команда Р является теми ворами. Брок находит Бонслая, напуганного и одинокого, и предлагает ему присоединиться к ним. Но будучи гордым покемоном, Бонслай сначала сражается, чтобы доказать свою смелость. Брок побеждает, а Бонслай становится новым членом их Команды.

Dutch Official Summary

Op weg naar de Strijd Slang, komen onze helden langs een Pokémon ninja school, waar ze de leerlingen helpen om hun Pokémon te redden uit de klauwen van Team Rocket.

Norwegian Official Summary

På vei til kampspissen, kommer våre helter over en Pokémon Ninjaskole, der de hjelper elevene å redde sine Pokémon fra Team Rockets klør.

Swedish Official Summary

På sin fortsatta väg till nästa strid, kommer våra hjältar förbi en Pokémon-ninjaskola, där de hjälper eleverna att rädda sina Pokémon ur Team Rockets klor!

Danish Official Summary

På vej til Kampspidsen kommer vore helte forbi en Pokémon-ninjaskole, hvor de hjælper eleverne med at redde deres Pokémon ud af Team Rockets kløer.