Board Thread:General Discussion/@comment-28026620-20160629144037/@comment-26887879-20160629150433

Mettaton also gave me the most deaths in my first playtrough and still gives me up to this day (when doing Pacifist or Neutral runs). My only tip is observe his attacks, it's all about timing (I know they get pretty fast after a while). I'm not sure, but I don't think you even have to shoot at his heart... His limbs start falling off automatically as you progress, I think.

Also, don't waste money on Glamburgers (if you did, doesn't matter), if you're doing Pacifist, Junk Food is enough...