@DeepImpact: To be fair, pokemon mythology seems to suggest that humans were created around the same time as pokemon (who were created near the beginning of the world.), and that they somehow had access to /magic/ at some point. The concept of an ancient league might not be that far off. Perhaps it's less about having fun though and more like a hierarchy of sorts. Perhaps the league is the government and the strongest is effectively the ruler.
I'm just musing though.