Before our beginning, there was nothing, nothing but an endless void, greater than infinity, devoid of rules or laws of nature. There was no concept of space or time, no matter, only consciousness. A consciousness with the urge to destroy, devour, consume, rip, shred. It would not, could not, allow anything to exist within the void, for its ultimate desire was isolation. Yet this consciousness was not alone, for out of the void emerged a group of beings, beings whose purpose was creation. Though their true name is unknown to us, we refer to them as the Creators. And our lord Arceus was one of them.
The Creators were mere consciousness themselves, but their will and power proved stronger. One by one they spread out through the void, flickering lights in the harsh darkness, pushing forward to create bubbles of existence. So too did Arceus make their way through the void, pushing the chaos back further and further, making walls around their infant universe. At last, the chaos was beaten, and Arceus had their universe to rule.
But why did Arceus make this universe of ours? What was their inspiration, their drive, their purpose? This particular truth eludes us, but we guess. Some say it was a random action, done simply to see if they could. Others say it was simply in their nature, a nature to create and design. I myself believe, though others may call it blasphemy, that there was a higher power that created our creator. A higher power that made the "egg" Arceus burst forth from, that gave them their purpose to dispel chaos and create order. Only Arceus knows for sure, and so far they have yet to enlighten us. Yet whatever the reason, be it grand design or random chance, our universe was born.
Yet at that point, the universe hardly resembled the one you know today. It is difficult to describe fully, for there were no such concepts as space or time. Even describing it as a massive bubble does not do it justice. So instead, I shall call upon that doorway to the impossible, that portal to the infinite, the imagination. Imagine if you will a realm both as tiny as a point and as massive as infinity. A realm where direction takes you nowhere, for not only is there no concept of direction, but also no time to allow anything to move or change. No matter at all exists yet, nor does light or electricity. Every conceivable law of nature that you live by does not apply, for none have been invented yet. This was the state Arceus' infant universe was in
Recognizing that, in this state, the universe could not support any form of creation, Arceus formed three new consciousnesses, each with powers to set the laws of the universe in order. The first, Palkia, created the three dimensions of space, commonly known as length, width and depth. With the limits and directions of space now defined, matter could exist and be created. The second, Diagla, created the fourth dimension of time, allowing matter to move, change, and transform. The third, Giratina, created matter itself (for this was before his corruption and fall). He created quarks and particles, combining them to form the photons of light and the protons, neutrons, and electrons of atoms. Atoms became molecules and took form, and at last the universe had the building blocks of creation. All this happened in a picosecond of picosecond, and the sudden burst of direction and motion and matter resulted in a massive bang. The universe had truly been set into motion, and now the great work could truly begin.
Now that the universe had form and substance, Arceus saw that it was cold and dark, lifeless, without a single star in the sky. To fill this universe with light, Arceus created the Blinding One, known now as Necrozma. This being was the original light, the radiant being from which the fires of every original star was sparked. In those days he was a benevolent and prideful being, who saw himself as the reason for all life and creation. This pride would eventually be his downfall.
Next, Arceus sought to create a planet, a world in which to focus their powers and to build upon. From the elements created by Giratina, Arceus formed a sphere next to one of the stars sparked by Necrozma, in the perfect place to form life. They set the Earth's core alight, unintentionally spawning a creature of magma and steel, and then created three new beings. The first was Kyogre, the alpha, who covered the Earth with an endless primordial sea. The second was Rayquaza, the delta, who surrounded the earth with a layer of air, to shield it from the harsh rays and vacuums of space. The third was Groudon, the omega, who raised the first landmasses out of the ocean, and who will one day stand alone in the endless desert at world's end.
Thus the universe and the Earth were formed, and it was deemed good and right. Yet this universe was still barren and lacking, until it was finally filled with the greatest marvel: life.
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Creation stories have always interested me as a mythology fan. While they can often be contradictory and anti-scientific, they often possess interesting nuggets of truth, such as the Greek interpretation of the universe being born out of chaos. I decided I wanted to combine more scientific, factual elements of the formation of the universe into this creation story, along with the more mythological elements of deities and such. Since it's impossible to know for sure what really happened at the beginning of everything, it's a lot of fun speculating. And hey, if you prefer Genesis to Big Bang or vice versa, who am I to judge? That's the fun of creation stories: since we can't be 100% positive, technically everyone's interpretation has at least some possibility. Unless you think the universe started yesterday. In that case, I don't know what to tell you.