Poké history class

Arceus gave birth to Palkia, Giratina, and Dialga. Palkia gave birth to Uxie, Azelf, and the other lake guardian. Arceus also banished Giratina to the Distortion world. Arceus later gave birth to mew. Mew turned into the fossil Pokémon and most of the legendaries. Then the fossil Pokemon evolved into other Pokemon. After fossil Pokemon the prehistoric Pokemon that aren't extinct yet. Like Lapras. Some Lapras stuck in the water and million of years later they turned into Turtuga. The ones that left the sea evolved into squirtles.