Keromatsu VS Gekogashira! Ninja Battle!! : Season 17 Episode 17

During our heroes' journey to Shoyo City, Satoshi and Keromatsu meet a young ninja named Sanpei and his Gekogashira. Satoshi challenges them to a battle, and Gekogashira defeats Keromatsu with an impressive Quick Attack. Sanpei is about to take his leave when Satoshi asks him for some special training--he's never seen anything like Gekogashira's Quick Attack, and wants Sanpei to teach Keromatsu how it's done. Sanpei agrees, and Keromatsu enters ninja training--and thanks to Serena's costume skills, Eureka, Dedenne, and Pikachu get to play ninja too. After Sanpei takes...