Pokemon the Series Season 19 Episode 6 The Legend of the Ninja Hero!

Ash and his friends arrive at a small village only to learn that the ninjas who used to protect the village have disappeared. The villagers are worried that they won't be able to protect themselves from the wild Pokémon that roam the nearby forest. However, they meet a young boy named Sanpei, who tells them about his grandfather who he believes is the greatest ninja in the world. Sanpei's grandfather was previously the protector of the village, and was known as the "Ninja Hero."

Sanpei wants to follow in his grandfather's footsteps and become a ninja like him, but he feels like he needs to prove himself first. He decides to challenge Ash to a battle, but Ash is hesitant at first. However, with encouragement from his friends and Sanpei's determination, Ash agrees to the battle. It turns out to be a close match, but Ash ultimately comes out on top.

After the battle, Sanpei takes Ash and his friends to a secret ninja training ground, where they meet Sanpei's grandfather. Sanpei's grandfather agrees to teach Sanpei and Ash some ninja techniques, and they begin their training. However, they are interrupted by the appearance of the villainous Team Rocket, who are also interested in learning ninja techniques.

Sanpei's grandfather is not happy with their intrusion, and he challenges them to a battle. However, Team Rocket uses their newest gadget to summon a giant robot to defeat him. Sanpei and Ash team up to stop the robot, but they are unable to do so. Just when all seems lost, Sanpei's grandfather reveals that he has a special technique that he has been saving for a special occasion: the "Ninja Art: Shadow Clone Technique."

With the help of the Shadow Clone Technique, the ninjas and Ash are able to defeat the robot and Team Rocket. Sanpei's grandfather recognizes Ash's bravery and skill as a trainer, and gives him a special gift to show his appreciation. The villagers are grateful to have their protectors back, and Sanpei feels like he has proven himself as a true ninja. The episode ends with Ash and his friends continuing on their journey, with Sanpei and his grandfather waving goodbye.