"Child of man. I am the one you call "Arceus". From the nothingness of the void I was born. And from nothing I made all. And from all, you were the one that called for me. Child of man.
…
Can you even see my true form?"

A primordial and ancient terror born from the ether of existence… In the beginning, there was darkness, and then…. there were monsters.

Man, if Arceus had this as a second form as like "Space Llama is a form you are comfortable with, THIS is what I really look like"