I have an idea for a fanfic...it may not appear original at first glance, but it honestly is! There's also a lot more to the story, so leave a comment if you think what I have so far is good :)
Let's say there are three Universes. There's the Paralyzed Universe (Sounds Similar to a Paralyzed World, doesn't it? [This would be known as hell]). Then there's the Living Universe (This would be the one where you and I live in; it contains multiple galexies and planets and whatnot), and then there's the Everlasting Universe (Okay, I haven't actually thought of a name for the last one, but I'm working on it [This would be known as heaven]). I'm not going to tell you excatly how those three universes came to be yet, but I'll ppost that on here shortly.
And for each universe, there is a ruler. For now, I'll just let you guess the rulers for the Everlasting and Paralyzed Universes, but do you know the ruler of the Living Universe?
Done guessing? Alright, it's Arceus! Arceus guards the Living Universe from not just assults from the Paralyzed Universe (From demons [bad souls]), but Arceus also has the power to bring all souls back to life if their death was untimely/not supposed to happen that way (This doesn't happen often, so don't get freaked out).
I'm not quite finished with this post, but I have school soon and should be getting ready
Okay, now I can continue!
So allow me to explain how the Ruler of the Living Universe came to be. The rulers of the Paralyzed and Everlasting Universes were just always there; try to wrap your brain around that. When Life was created in the Living Universe and . . . well when life started to happen, it was decided that a guardian was essential to govern and protect the Living Universe. So, the two rulers created an Egg. The Egg hatched, and thus the birth of Arceus (And if you don't know what happens after the Egg hatches, check out the Library in the Sinnoh Region). The three guardians managed to balance each other's power out for a long, long time.
But one day (This is still way before Humans were created), the ruler of the Paralyzed Universe has the Demons (Souls deemed bad when their life as something alive ended) attack the Living Universe in the attempt to gain...area...and more bad souls, and manages to destroy Arceus as he tried to protect the Universe. The ruler of the Everlasting Universe barely manages to drive out the Bad Souls (thus saving the Living Universe), and from that point on the two Universes kept a close eye on each other.
Another day, long into the future (Awhile after humans are created) and some more fighting between the two Universes, the Everlasting Universe decided that Arceus really was needed to guard the Living Universe, because the ruler of the Everlasting Universe couldn't protect both efficiently. So Arceus was secretly re-created, but because he couldn't be created with the help of the Paralyzed Universe's ruler, he had some flaws; like he had to be born into a human. The ruler of the Everlasting Universe understood this, and deemed him still able to protect the Universe. So Arceus was re-born in the form of a human girl to the parents of Emily and Spencer Prescott, and she was christined Lilly Prescott.
Let me know if you want to hear me continue or if anything is confusing, because I know this is a lot of info right here!