New summary:
Satoshi's classmate Māmane wants to evolve Dendimushi into a Kuwagannon, so he decides to go to the Vast Poni Canyon, where there's apparently a mysterious power present. Satoshi's classmate Suiren and her Ashimari, on the other hand, have met their master I'a and her Ashirene, and are eager about the possibility to learn all their moves.