Board Thread:General Discussion/@comment-37252837-20190213205410/@comment-35615238-20190216224513

The Phoenix Studier wrote: and they are bosses They're secret bosses. They aren't part of the game's canon, and they also require difficult requirements to find, so they're secret bosses. Temmie, however, isn't a boss, because all bosses are required to be killed in the Genocide route, and killing 18 monsters in Waterfall without killing Temmie will not ruin the route, as it does in Snowdin if Snowdrake isn't killed. Also, there's no way Monster Kid could be a boss because you don't "fight" him. He just determines whether you continue genocide or not, since sparing him will play the Undyne fight normally while attacking brings you Undying.