Born on Akala Island, Jo grew up helping his single mother run a coffee shop. By the time he was old enough to take the trials, he had befriended and captured a Rockruff. With her help, he had surpassed his childhood friend's predictions and achieved his dreams. Defeating the fourth Alolan Champion, he took up the title a week before his twentieth birthday. For two whole months, he stood atop Mount Lanakila before being defeated. Many might have been driven to try and once more gain the ultimate title, but Jo took this chance to resume his exploration of the four islands and left the League behind. By the time he reached the age of twenty-five, Jo dedicated his life to helping preserve the customs and habitats of thee quickly growing Alolan Region as well as the tourist. Claiming to be an Island Guardian, he leads his former Champion team to confront challenging issues.