Ash & co. have gone to Poni Island to work on various research projects. However, Ash is eager to complete his Final Grand Trial and decides to look for the Kahuna, but upon learning there isn't one at the moment, he isn't sure what to do. Soon after that, a trainer named Hapu appears and attacks Ash, thinking Ash has stolen some fruit from the field. To top it off, Team Skull has started to appear on the island. Will Ash be able to clear everything up?