The mini-saga follows Satoshi venturing into an archipelago of islands called the Decolora Islands with Iris and Dent.
Source: Bulbapedia
Koromori (Musashi)
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Satoshi, Iris and Dent continue their travels through the Isshu region. After successfully winning his eighth Gym Badge against Homika in Tachiwaki City, Shirona invites everyone to stay at her villa in East Isshu, where old friend Hikari is also staying, and participate in the Pokémon World Tournament Junior Cup before Satoshi participates in the Unova League. Team Rocket,…