Sans and Undyne the Undying are the only actually hard ones, the rest are pretty chill if you got recovery items. But Touhou would probably kick 200% more ass than either of those.
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BurbleBurble
Shiny Blue Gardevoir
It does. I think that Cirno outranks the UT bosses in terms of difficulty, and that says a lot...
<Inkscape>
Nah, if you count disbelief Papyrus, but is he even real?
BurbleBurble
No. It's some fanmade thing.
<Inkscape>
well, there is a demo that is hard as F
Shiny Blue Gardevoir
Go and watch a playthough of Touhou Perfect Cherry Blossom on Lunatic mode, and tell me that Undertale is hard