What is the Hardest SSB4 Challenge?

[9070]

It took @Heart like 300 hours of grinding to get all of the mii hats.

I'll go with that

 

[Trainer Red]

my hardest challenge SSB4 is trying to do the 9.0 difficulty on classic mode, I get all the way to the end and the master core demolishes me with a few hits. I'm trying to learn more about dodging certain attacks in order to win it. its for an event as said under challenges.

 

[Mrmariobros222]

Mine is Get 8 K.O's with lucina.

Mine is to beat that freaking master core on 9.0 without dying once! Is almost impossible on the master fortress since the place is full of enemies that spam lasers and do tons of damage, especially that there's a danger zone if you have 100% of damage and most of the time i get hurt the most on the dog and the sword form. (some attacks are tricky for me to dodge)