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>This Pokémon is revered as a deity in Hisuian legend. The birth of Dialga was what caused the vast river of time to begin flowing in our world.
>Radiant light caused Dialga to take on a form bearing a striking resemblance to the creator Pokémon. Dialga now wields such colossal strength that one must conclude this is its true form.
>This Pokémon is feared as a deity in Hisuian legend. The birth of Palkia was what caused the walls of our world to disappear, creating a sky that spans for infinity.
>It soars across the sky in a form that greatly resembles the creator of all things. Perhaps this imitation of appearance is Palkia’s strategy for gaining Arceus’s powers.
If broken Dialga and mutilated Palkia are their origin/true forms then what's the explanation for their default forms? Giratina default form is actually a modified form and its true base form is origin, same as with Groudon and Kyogre, the old ones are depowered versions of the true legendaries which only appear via Primal Reversion, but Giratina, Groudon and Kyogre all have an excuse for the change. What caused Dialga and Palkia to stop looking like Arceus and become more dinosaur like?