Continuing their Summer School adventure. Ash & Co. are sent to a nearby lake to investigate reports that Pokémon are getting hypnotised there. Their task is to work out whats behind it and write a report on it. However, everyone wants to find out the reason first. Who will write the best report?

It's the end of the Summer School and time to see who is the most triumphant. How is this eventually determined? By a Triathlon race over land, sea and sky. Each trainer has to choose a random Pokéball for their companion for each part making it a very hard contest of strength, skill and knowledge. Who will win?