Satoshi, Iris, and Dent have successfully obtained their 8th Gym Badge in Tachiwaki City, while exploring the Isshu region. Shirona, impressed by their achievements, invites them to stay at her elegant villa in East Isshu. Additionally, Hikari, an old acquaintance, is also lodging at the same place. The group plans to participate in the Pokemon World Tournament Junior Cup, before Satoshi competes in the Unova League. Meanwhile, Team Rocket is determined to end their Isshu journey on a high by capturing the mythical Pokemon Meloetta. However, the extent of their objectives remains unclear.