Board Thread:Questions and Answers/@comment-27327020-20160404174206/@comment-27327020-20160408093438

I thought Mettaton NEO can take about 900 000 to 999 999 damage, anything less will not kill him instantly (I think, cuz im not sure about that)

Yeap, while it is true that Sans, without Karmic Retribution Ability, will be much more easier than with the ability, it doesnt mean it will be an very easy fight. He still have other abilities to aid him in his battle against non-evil characters. While his attacks just only deal 1 damage only, he can just repeatedly spam the heck out of those attacks. He can spam attacks like the Gaster Blasters, Bone attacks etc and he can still use Soul Manipulation on them.

Despite only having 1 HP, his dodging abilities makes up for this. He literally can dodge attacks that literally can destroy entire worlds from Frisk/Chara. Heck, he can even dodge them in his sleep. The only reason why Frisk/Chara wins is because they actually cheated the game, and Sans cannot counter this so eventually he gets hit by a extremely deadly attack. However, the only known characters who can technically cheat the game is Sans himself, Frisk, Chara, Omega Flowey and Asriel. So any other game characters who is fighting Sans will never hit him. Plus, he has teleportation, not only he can just instantly teleport away from the attacks, he also can teleport this foes into his attacks. During his fight with Frisk/Chara, he repeatedly kept on teleporting them into his attacks which makes it nigh-impossible to dodge them.

Also, remember, while Sans is lazy, he is a genius both in a tactical and scientific sense. He can use this to outsmart his opponents.

So lets say, if he is fighting characters like Asgore or Undyne, they will never hit him in anyway possible. Although Sans will take a longer time to kill them (Sans only deals 1 damage and the characters I have mentioned above have a crap ton of Health), he will never get hit and will spam his attacks in one go.