Heidi, Sapphire, and Melony all go out on a Pokémon journey together in the Sinnoh Region.
Heidi journeys with Lati to help the child better understand the Pokémon World. Together, they caught several Pokemon, eventually keeping a Zubat, a Bronzor, and a Shiny Feebas.
Sapphire is stalked by a strange creature throughout her journey.
At the same time, Lauren journeys with Jeanne and Daiyu in an attempt to discover a world where Lauren is an Arceus to learn more about herself as a person. Working together, the three of them descended into The Abyss to enlist Mona's help to to take them to just such a world. In exchange for Mona's help, Lauren pledged herself to Mona as her Retainer to serve her.