The ninety-first episode of Hollywood World
When Mitsuki gets hit by a black Z ray, she turns into an evil version of Full Moon called "New Moon", which is triggered by a dark song. She fights through singing, which the Powerpuff Girls Z have trouble fighting through. But maybe some certain Mermaid Princesses can help....
Alomomola (Lucia's; debut)
Azumarill (Hanon's; debut)
Politoed (Rina's; debut)