Cuphead VS Undyne the Undying and Sans

Description
Caphead may be one of the toughest games with the most difficult Bosses but will the hero of the game be able to face the Hardest Bosses in Undertale?

Interlude
Janemba : Man, is not Caphead so difficult?

'''Flowey : But my verse has two bosses who have been known for their great difficulty and a lot of suffering with them. Do you understand what I mean?'''

Janemba : The bosses of Genocide

Flowey : Yes, the warrior who has the power of determination Undyne the Undying and The skeleton gives you a lot of bad time Sans

Janemba : Oooo...oooo I'am Janemba the demon from dragon ball's hell

'''Flowey : And I'am Flowey the Flower. And it's our job to analyse their weapons, armor and skills to see who would kill and who would be killed'''

Janemba : It is the time of death battle!!!