I hope you're going well.
The Harlequin boss is not easy at all, I agree.
Unfortunately, you'll have to fight the three fake ones, before the real one appears. And dodge the eyeballs on cemetery ground in the meanwhile.
Beware though, as between the third and the fourth battle, you don't have time to recover.
Don't forget also that you can cast 'Shield' (and of course '1st aid') from the menu now. You should also make sure to get a dozen green potions and a few moon juice potions
before entering the cemetery, as the boss knows how to remove your SP.