In my playthrough of Undertale, I first did a mostly pacifist run except for killing Toriel. The second time I did a completely pacifist run.
When I got to fighting Asgore, I lowered his HP until I was able to give him mercy. and then I did. Then I met Flowey and he told me to go back and make friends with Undyne.
After going back to Snowdin, I can't find Sans, Papyrus, or Undyne anywhere. What do I do?
Best Answer
You once received a phone call from Papyrus, who invited you for hanging out with Undyne. In any case, go to the Waterfall, at Undyne's house, and you will be able to start befriending her.
Also, if you didn't give her water after your fight with her, you invalidated the possibility to befriend her. You will have to start another game.