Board Thread:Questions and Answers/@comment-5155207-20160806222949/@comment-27701762-20160806230116

That's a bit strange. By the more reliable indicators you haven't completed the requirements yet. One of the problems is that encounters become a lot harder to come across as you kill more monsters, meaning you have to wait for longer (it's also the case that some rooms don't have encounters).

I don't quite recall whether the cutoff point is getting to Toriel's house, or actually entering into the battle with Toriel. One thing you could do is save, then battle Toriel. If you get the insta-kill, then you're safe. If not, go to an area where you know there are encounters, then hold Up+Down for a bit in the hopes of getting an encounter. If that doesn't work, you might need to just start over.