Long ago, 3 divines created the universe. Elysium, Eternity, and Evolution, also known as The Mask. They created a world with multiple creations, these were called the Precursors. The Precursors lived in a paradise. However, the Precursors took sides, fighting for whatever Devine they believed in, each of these factions destroyed each other. The Precursors wiped themselves out, however one Precursor survived: Arceus.
The Devines gave the last of their strength to Arceus, and Arceus rebuilt the world. Creating Humanity and Pokemon. The Divines fell into slumber, unable to create or destroy anything. To keep balance to the world, Arceus created the Chosen. Warriors blessed with the powers of Light, Darkness, Shade, Void, Fear, Time, Space, Matter, Force, Purity and Corruption. Whoever should hold these abilities will guard the balance of the world, either by destroying evil, or becoming evil.
Arceus fell into a slumber of his own, leaving the world to flourish.
...
400,000 years later, A continent called Celatia became the world leader in Technology. The Continent is inhabited by only Pokemon, who without human influence, have flourished at a rate 3 times as fast as humanity allowing them to pass human technology by decades.
In the year 2187. Reyes Nocturne, a Darkrai and Alan Helter, an Abra, founded a mafia called Robber Force. As un-creative as it's name was, it became Celatia's most feared mafia. However, Team Galactic invaded. This caused Robber Force to shift it's ways and defend the world from the Ruin, a massive creature being controlled by Galactic. They were successful. However, in 2189 A civil war broke out between whether Robber Force should stay a Mafia, or become a force for good.
Reyes and Alan were defeated by Yami Nightbring, a Zoroark, and Mayrum Covelight, a young Quilava. Solidifying the Idea of Robber Force being a force for good. For a decade, Robber Force became a symbol of hope. However, Yami had a child, something that had been agreed on that there would be no legacy to Robber Force. Mayrum, enraged, exiled all of his followers, which consisted of half of all Robber Force.
Now, in 2207, The Nightbring Clan, a clan founded by Yami and led by his son, Vision. Inhabit the north Side of Celatia, whereas the Covelight, led by Mayrum, inhabit the south. The two factions are fighting a civil war with no end in sight.
...and this is where our story begins...