Talk:SAVE/@comment-27646870-20160120193803/@comment-27701762-20160826170436

Gogos, you cannot have completed a True Pacifist route or done a True Reset. If you kill Toriel and move on, then you are off the True Pacifist route. Likewise, a True Reset literally resets everything: the game does not remember your previous actions, with only a few minor exceptions. It is essentially the same as having uninstalled and reinstalled the game.

What you are describing is completing a Neutral route and resetting the game.

To solve the problem, you can simply play through the game again. If so far you haven't killed any monsters, then just play through the game as usual. Do the date/hangout with Papyrus after his battle, and do the hangout with Undyne after her battle. Then as you are going to the Core you should get a phone call from Undyne to pick up a letter for Alphys. From there you will be able to complete the True Pacifist route.