>>49553884Zacian is not.
Legends Arceus made it clear that the Pokémon versions of Dialga, Palkia, Giratina, and itself are all incarnations and significantly weaker spawns. Their true forms and powers cannot be accessed in the universe. They are beyond any one universe or timeline. They exist outside of space-time.
Zacian is stronger than any individual spawn on paper, but overall these Pokémon in their true forms and powers are limitless.