Rainbow Storm (レインボーストーム Reinboosutoomu?) is Cure Black and Cure White's third and strongest attack in Futari wa Pretty Cure. It is one of the few ways to purify the objects obsessed by the Zakenna, so it can commonly be named a finisher. Black and White can only use this attack when they are together and have Pollun close. When the power of the Prism Stones are gone from his body, the girls cannot perform this attack anymore.
Pollun shouts out "Don't give up!", and light surrounds him. A card appears before the Rainbow Commune, and he tells Pretty Cure to receive the Power of Light. Light then strikes each of the girls' arms, giving them the Rainbow Bracelets. They then hold their hands, chant, and then shout out the attack's name. Directly after that, they reach their other arms toward the enemy, the arms pull back forcefully, and reach out once more. A grand beam of rainbow light is shot from their palms, and the enemy is swept into the rainbow beam, getting purified.
Cure White: 希望の力よ！光の意思よ！
Cure Black: 未来へ向かってすき進め！
Pollun: Makecha dame-popo!
Pollun: Hikari no Pawaa wo uketore-popo!
Cure White: Kibou no chikara yo! Hikari no ishi yo!
Cure Black: Mirai e mukatte tsukisusume!
Both: Purikyua Reinboosutoomu!
Pollun: "Don't give up-popo!"
Pollun: "Receive the Power of Light-popo!"
Cure White: "O Power of Hope! O Will of Light!"
Cure Black: "Face toward the future and press onward!"
Both: "Pretty Cure Rainbow Storm!"
Pollun: I entrust you with the Power of Light!
Cure White: With the Power of Hope and the Will of Light!
Cure Black: We face the future and continue to fight!
Both: Pretty Cure Rainbow Storm!