there are a lot of changes for all kinds of different things, and i dont think anyone really knows them all
also, to do genocide, it's not enough to spare nobody. you have to hunt down and kill every monster in each of the four areas. you'll know it worked if you get a random encounter where no monsters show up
also, to do genocide, it's not enough to spare nobody. you have to hunt down and kill every monster in each of the four areas. you'll know it worked if you get a random encounter where no monsters show up