Here are the candidates for the easiest boss:
@Sans2345 I think you mean that Mettaton NEO has the highest ATTACK in the whole game, not defense. His ATK is 90 and DEF is 9.
I think mettaton
Papyrus i think its like sans but way easier
Maybe toriel
A lot of youtubers beat toriel on their first try when they just started
It is asgore
I mean when you fight him on genocide
Sans and Papyrus
Asriel dreemurr and toriel as they are unlosable. no matter how hard you try you can't lose to them
Mettaton NEO for sure
What do you think?