Boss: Mystery Man and Yo-Yo
Mystery Man's Info:
Attacks: Cure Ballad, Beat Sonic, Swing Call, EX Galaxy Spear
Attacks: Mega Light Blow
For this fight, keep Atsuma in the back row and use his strong attack and heal when needed. If you dont keep him in the back row he will die quickly, so keep him in the back and you'll be fine.