Cynthias bloodline descending from Arceus having human fun in one of their horny phases would go a long way to explaining why her ancestry seems to have a lot of connection to his mythos anytime they appear in a game.

Even if it's not completely canon and never will be, I feel like this myth explains so much about why the Pokemon world is the way it is. Almost all Pokemon enjoy competition and battling, which stems back to Arceus's battle with the Titan, and almost all Pokemon enjoy companionship with humans, which stems back to Arceus being cared for and falling in love with a human. Of course Arceus would create the Pokemon world the way that it is when these were two of the earliest major experiences that it went through. It makes perfect sense.