One Piece: My Name Is Arceus

When the creator god Arceus transmigrated through time and space, it did not fall into the familiar world of Pokemon. Instead, it plunged into the pirate age of chaos 800 years ago. In those days, the World Government was raising its blades to hunt the Lunarians, who had gray wings on their backs and golden flames burning across their bodies. On the cliffs of the Red Line, blood and fire stained the abyss red.

Arriving in the form of a Creation Egg, Arceus was gravely wounded soon after its arrival, despite carrying eighteen Plates. Twelve of them scattered across the pirate world, leaving only six by its side. In its desperate predicament, it used the remaining power of its Plates to drive back its pursuers and form a pact to protect the Lunarians, who were on the brink of extinction. Severely weakened by the strain of traveling through time and space, Arceus decided to fall into a deep slumber. Before departing, it used the power of the six Plates to create two guardians: Mew, who could travel through space and sense danger, and the Tree of Beginning, rooted on an island in the deep sea, able to repel enemies and heal wounds. Together, they built the Lunarians their last sanctuary.