At the start, only a Hall existed with Arceus. It felt alone and bored. Then it wanted to create a world. And so Arceus created Dialga and Palkia, that made time and space. However both started to rampage. So Arceus created a doomed Chain that absorbed both. But the chain needed to be get rid of without it's seal breaking. So he made Uxie, Mesprit and Azelf. Each got one third of the chain inserted into their heads. Arceus see a world that were nothing but what it was. Then he created more Pokémon to create more things - Ground, Water, Sky, Weather, Night, Moon, Fire. That world turned beautiful, but nothing habitated it. But Arceus's power had been almost completely drained away - so he created Mew to create Pokémon, and Giratina to kill 'em. But these two drained every last bit of its power.
THE END