My theory is that Arceus used the help of Dialga and Palkia to create the Universe.
If Arceus is God, as in monotheistic religions, technicaly wouldnt Dialga and Palkia be creations of Arceus rather than being enlisted?
of course programing is a poor way to relate to this, but when creating a new "object", let's call it space, you would first need to write the Dimension statement, which means that the Space dimention would be present. if Arceus came after D&P, Wouldn't time and space already exist?