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Ash and friends board a ship which will take them to the location of the Sinnoh League. On the boat they meet a trainer named Buck. They decide to help him find a treasure which is said to be located on a nearby island.
Ash and friends run into Kenny who is having a special training session with Olivine Gym Leader Jasmine. Kenny is already preparing for the next Grand Festival, and this worries Dawn as she has not decided what her next step will be. Kenny challenges Ash to a battle and says that if he defeats him, then Dawn must travel with him. Who will win the battle?
It is almost time for the Sinnoh League competition to start. Knowing that the Sinnoh League is going to be tough with rivals like Barry and Paul competing, Ash decides it is best if he uses Pokémon not only from his Sinnoh journey, but all his other past journeys as well. However, which ones will he choose.