>>58917485Not died, they just abandoned Kanto (because of course it's a Kanto game, if they're following the Builders format of "old game world falls into ruins" why wouldn't it be Kanto?) when their industrialization grew out of control and bit them in the ass, leaving the Pokemon to clean up the mess and restore the region to its natural glory.
At least, that's the general concept that was going around internally based on the Teraleak. No mentions of human death.