From Bulbapedia, the community-driven Pokémon encyclopedia.
Magical Pokémon Journey: Rockabye Pokémon is the twenty-eighth monthly issue released by VIZ Media of the Magical Pokémon Journey manga created by つきりのゆみ Yumi Tsukirino. It contains the ??? chapters of the manga. The chapters originally released in this book were later rereleased as part of Volume 7. As a bonus, it contained a fold-out color poster which was not part of the regular volume.