I’m doing the genocide route on my PS4, and I’ve cleared both hotland and the CORE, however there is one more monster left and I can’t find them, I’ve backtracked through the entire map (Hotland and CORE) at least 3-4 times, it’s been almost three hours and I still can’t find them. Is this a bug? Or do I have to look in a certain area?

(I first started off in Hotland, I got around a dozen or so kills and then got the rest of the kills in the CORE, have I missed one in Hotland or something?)

  • Have you fought Mettaton NEO yet?
    – Kevin
    Commented Dec 2, 2021 at 3:51
  • Yes, I have fought Mettaton NEO.
    – TheBaron
    Commented Dec 2, 2021 at 4:02
  • Welp, you get the Alphys route now Commented Apr 27, 2022 at 20:55

2 Answers 2


It's too late. Once you fight Mettaton NEO, you are locked into whatever ending you have gotten (unless you have a save from before the fight, in which case you should load that save and try again). No more enemies can be randomly encountered in Hotland or the CORE (or anywhere else in the game, for that matter), and you are now going to get the worst neutral ending instead of the genocide ending.

Next time, make sure you completely deplete the kill counter before fighting Mettaton NEO.


Grind by walking back and forth by the fancy boss door before you fight Mettaton Neo, you will find a monster soon enough.

  • @pinckerman How does it differ though? Basically both of these answers states that you must kill the monsters before fighting against Mettaton NEO. I would just say this answer doesn't add anything new to it.
    – Skye-AT
    Commented Dec 22, 2021 at 4:32
  • @Skye-AT I might have misunderstoon what he meant with "the door before you fight Mettaton". In that case it's a dupe, yes. But I flagged to delete it anyway
    – pinckerman
    Commented Dec 22, 2021 at 7:06

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