Satoshi meets Hala, the Kahuna of Melemele Island, who created his Z-Ring. As part of Satoshi's first Island Trial Challenge, Hala tasks him with finding a solution to an infestation of Koratta and Ratta without fighting them. Thanks to his friends' suggestion, Satoshi decides to recruit the local Yangoos and Dekagoos. However, Satoshi must defeat their leader in battle in order to earn their cooperation.