Talk:Undyne/@comment-26398979-20160325030234/@comment-27701762-20160325031335

No. To complete a Genocide run you have to complete several criteria as you move on. Not killing/sparing Papyrus would put you on a Neutral route (assuming you were previously on a Genocide route), which would in turn mean your fight with Undyne would have been a "normal" fight, as opposed to the fight against Undyne the Undying.

If you're trying to do a Genocide run, you'll need to start over.