Precure All-Stars DX3 Mirai ni Todoke! Sekai o Tsunagu Niji-Iro no Hana

The former nemeses of the Pretty Cure have merged and reincarnated into one colossal being called Black Hole. He intends to find and destroy the Prism Flower, a magical source of light that connects all the different fairy worlds to planet Earth. All Precure must join forces to defeat this overwhelming evil.