The Origin of Pokémon

Once upon a time, Arceus created Dialga, Palkia and Giratina. He gave Dialga power over time, Palkia power over space, and Giratina power over something else. However, Giratina betrayed Arceus, who then banished him to a parallel dimension called the Distortion World, where time and space didn't exist since Palkia and Dialga didn't have control. Because Giratina was banished to the Distortion World, however, he did not help create the universe, hence the universe does not have whatever it is he got power over.

Dialga and Palkia later continued on and created the world, in which Arceus created Groudon, Kyogre and Rayquaza. Groudon created land, Kyogre created the waters, and Rayquaza created the skies. After this, Arceus came back and created Mew, and between them Uxie, Mesprit and Azelf was born. Arceus gave the three powers over dimensional travel, thus making them the bridge between the universe, the dimensions where Palkia, Dialga, and Arceus lived, and the Distortion World.

By now, Arceus had created too many things to possibly control by himself, so he created the Unown, mysterious beings able to bend reality using their combined power. Many millenniums later, prehistoric Pokémon such as Omastar, Kabutops, Genesect, Aerodactyl, Cradily, Armaldo, Bastiodon, Rampardos, Carracosta, Archeops, Tyrantrum and Aurorus went extinct because of meteor showers happening at Meteor Falls and Mt. Moon, which brought over Mew's offspring with Rayquaza - Cleffa, Lunatone, and Solrock.

After all this, some Pokémon started gaining interest towards the Unown and learned from them to build, write, and farm. These would later evolve (Darwin way) into humans. The humans later had a war in which AZ (the king of Kalos)'s Floette died, so he created a super weapon that killed many Pokémon, which resulted in Virizion, Cobalion and Terrakion join the war.

Finally, 2000 years later, Red is born in Pallet Town.