Miracle Petals

In order to restore the Prism Flower, the Prism Hearts Precure must gather the Miracle Petals (ミラクル花片 Mirakuru Kahen) of the previous Precure teams. Each Greater Power they hunt for has an associated lesson with it.

By unlocking the Miracle Petal of a previous team's Prism Cards, the Prism Hearts Cures can access special powers, often a special attack based on the previous Precure teams' special powers. The creation of a Miracle Petal is signaled when the Prism Cards of the team that has been unlocked start to glow before the card appears to the girls.

Nature
A Miracle Petal is a special golden card that contians the Pretty Cure Insignia of the represented team. This can be used much like any other Prism Card, however it can, with the exception of three of the Miracle Petals, can only initiate a purification attack

The Miracle Petal of a Precure team can be transferred remotely to the Prism Cards when at least one member of the team approves the Prism Hearts Cure's worthiness. It can be transferred directly via a physical contact with the cards as well. Once the power is taken from a member of the Precure team, all other members' Power will be lost too.

It is revealed that inexperienced Precure teams may be unaware of their own Miracle Petals, like in cases of the Prism Hearts and Shinobi Stars team.

Futari Wa Pretty Cure Max Heart
The Prism Screw (プリズム・スクリュー Purizumu Sukuryū) is an attack that can only be performed by Cure Light and Cure Splash, where they use the power of light and water to fire a powerful beam that purifies the opponent. It funcions and is visually similar to the Marble Screw (マーブル・スクリュー Māburu Sukuryū)

The Futari Wa Pretty Cure Miracle Petal was granted to the Prism Hearts Precure by Misumi Nagisa (Cure Black) during their third fight against Cure Hunter, before it evolved thanks to Aya's efforts to upgrade her initial finisher, the Aurora Screw (オーロラスクリュー Aōrora Sukuryū), into the Luminario Wave (ルミナリオウェーブ Ruminario U~ēbu)

Futari Wa Pretty Cure Splash Star
The Heart Stream (ハートストリーム Hāto Sutorīmu) is an attack that requires all of the corresponding Prism Cards to work, which allows the girls to perform a combination attack of the Cure's Twin Stream Splash (ツインストリーム・スプラッシュ Tsuin Sutorīmu Supurasshu) and Spiral Star Splash (スパイラルスタースプラッシュ Supairaru Sutā Supurasshu)

The Splash Star Miracle Petal was granted to the Prism Hearts Precure by Mishou Mai (Cure Egret) during Cure Papillon's battle against Bottom

Yes! Pretty Cure 5 GoGo
The Flutter Dream (フラッタードリーム Furattā Dorīmu) is an attack that's usable by any of the Cures and it allows them to send out a swarm of butterflies to bind an enemy in place.

The Yes! 5 Miracle Petal was initially extracted frim Yumehara Nozomi (Cure Dream) by Cure Hunter, but was taken back by Cure Noble, whose efforts helped evolved the Miracle Petal and upgraded her finisher, the Dreamy Bash (ドリーミーバッシュ Dorīmī Basshu), into the Midnight Breaker (ミドナイトブレーカー Midonaito Burēkā)

Fresh Pretty Cure!
The Clover Slam (クローバースラム Kurōbā Suramu) is an attack where a prism appears in the hands of one of the Cures and they start passing it around, the prism growing larger and more colorful as it goes. Finally it’s passed to Aya and starts glowing like a rainbow. She then proceeds to hurl it towards an enemy.

The Fresh Miracle Petal was granted to the Prism Hearts Precure by Higashi Setsuna (Cure Passion) in order to help the Precure defeat Kan Passion

Heartcatch Pretty Cure
The Blossoming Fortissimo (ブ ブルーミングフォルティッシモ Burūmingu Forutisshimo) is an attack that can only be performed by Cure Light, Cure Splash, and Cure Trinity, in which Cure Trinity boosts the power of Cure Light and Cure Splash's Aurora Screw and Aqua Break into one attack. This attack is functionally similar to the Shining Fortissimo (シャイニングフォルティシモ Shainingu Foruteshimo)

The Heartcatch Miracle Petal was granted to the Prism Hearts Precure by Tsukikage Yuri (Cure Moonlight) during a battle against a Cologne-possessed Desertrian

Suite Pretty Cure!
The All-Star Symphony (オールスターシンフォニー Purikyu Aōru-Sutā Shinfonī) is an attack that can be performed by the core six members of the team, in which they start to play a tune before unleashing a series of sonic blasts towards the opponent.

The Suite Miracle Petal was granted to the Prism Hearts Precure by Shirabe Ako (Cure Muse) after she had taught the attack to the girls

Smile Pretty Cure!
The Elemental Roulette (エレメンタルルーレット Erementa Rurūretto) is an attack that requires any of the corresponding Prism Cards, in which each Cure uses an elemental variant of the team's finishing attacks. They include the Light Burst, Sunshine Inferno, Max Thunder, Hurricane Shoot, Blizzard Break, and a variant of the Happy Shower called the Candy Shower.

They also gain the Candy Hammer and Pop Sword, which summon the two Smile fairies and transform them into weapons the Cures can use in battle. Cure Echo can use these as well but not Elemental Roulette.

The Smile Miracle Petal was granted to the Prism Hearts Precure by Hoshizora Miyuki (Cure Happy) after the Cures had escaped a storybook created by Kan Happy

DokiDoki Pretty Cure!
The Miracle Prism Lights (ミラクルプリズムライト Mirakuru Purizumu Raito) are the Precure's main attack item, they resemble the Miracle Lights and can enter a battle mode when using a Prism Card.

The DokiDoki Miracle Petal was granted to the Prism Hearts Precure by Aida Mana (Cure Heart) and Regina after Ayumi had helped the two for the day

Happiness Charge Pretty Cure
The Mirror Burst (ミラーバースト Mirā Bāsuto) is a special combination attack that combines two Precure's finishing moves together.

The Happiness Charge Miracle Petal was granted to the Prism Hearts Precure by Hikawa Iona (Cure Fortune) after Aya was able to outlast the girl in a one-hour battle

Go! Princess Pretty Cure
Initially, Kuroro's ability to transform into a Prism Changer constituted as the Miracle Petal, but later on Cure Noble was able to combine her power with that of Cure Papillon and Cure Mirage to create a variant of the Trinity Explosion (トリニティエクスプロジオン Toriniti Ekusupurojion) called the Royal Fantasy ( ロイヤルファンタジー Roiyaru Fantajī)

The Go! Princess Miracle Petal was granted to the Prism Hearts Precure by Haruno Haruka (Cure Flora) after Jou had gained the resolve to become a Precure

Mahou Tsukai Pretty Cure
The Heartful Rainbow (ハートフルレインボー Hātofuru Reinbō) is an attack that the Precure can recreate using the corresponding Prism Cards.

The Mahou Tsukai Miracle Petal was initially stolen by Cure Hunter after it was extracted from Izayoi Riko (Cure Magical), but it was taken back by the Precure.

KiraKira Pretty Cure A La Mode
The Kirakiraru Prism Fantasy (きらきらるプリズムファンタジー Kirakiraru Purizumu Fantajī) is an attack exclusive to Cure Noble in which she creates a ball of concentrated Kirakiraru into the air that spins around, spraying its contents in all directions.

The KiraKira Miracle Petal was initially stolen by Dark Onibi after it was extracted from Usami Ichika (Cure Whip), but it was taken back by the Precure.

HUGtto Pretty Cure
The Trinity Concert (トリニティ・コンサート Toriniti Konsāto) is an attack that can be recreated using the corresponding Prism Cards.

The HUGtto Miracle Petal was granted to the Prism Hearts Precure by Aisaki Emiru (Cure Macherie) after seeing Hikari gain the resolve to become Cure Trinity

Star Twinkle☆Pretty Cure
The Shining Star ( シャイニング・スター Shainingu Sutā) is an attack that only Cure Light and Cure Splash can perform, in which they can perform a duo variant of the Southern Cross Shoot

The Star Twinkle Miracle Petal was granted to the Prism Hearts Precure by Yuni (Cure Cosmos) as a means to defeat Kan Cosmo

Healin' Good Pretty Cure
TBA

Cyberverse Pretty Cure
TBA

Sporty Pretty Cure
The Reyleigh Shoot (レイリーシュート Reirī Shūto) is an attack exclusive to Cure Trinity, in which she creates a ball of light that can be kicked straight into an opponent. It is visually similar to Cure Goal's Spiky Shoot

The Sporty Miracle Petal was initially stolen by Bottom after it was extracted from Kettei Natsumi (Cure Allez), but it was taken back by the Precure.

Dino Spirits Pretty Cure
The Dinosaur Carnival (恐竜のカーニバル Kyōryū no Kānibaru) is an attack that can be performed by the core six using the corresponding Prism Cards, in which the Precure summon the spirits of the velociraptor, pteradon, smilodon, pachyrhinosaurus, and tyrannosaurus rex to stampede onto the opponent.

This Dino Spirits Miracle Petal was almost stolen by Bottom from Katsuki Rentaro (Cure Gnaw) but he was able to send it to the Precure in time

Prism Hearts Pretty Cure
Miracle Form (ミラクルフォーム Mirakuru Fōmu) is a special transformation that can boost the powers of the Precure and even allow them to use the Prism Finale (プリズムフィナーレ  Purizumu Fināre), where they focus their power into one point. This causes a barrage of rainbow beams to burst forth and hit the enemy.

The Prism Hearts Miracle Petal was created after all of the Precure had gained their Miracle Forms, before it was evolved by Cure Echo's Miracle Form, allowing the group to combine into a single entity named Cure Mother (キュアマザー Kyua Mazā)

Trivia

 * Mutliple Miracle Petals can be used at the same time
 * The Prism Heart Cure's creation of the Miracle Petals is similar to the Gokaiger's acquisition of Greater Powers and the unsealing of Kamen Rider Decade's Rider Cards. In all three cases, a lesson or conflict must be resolved before a past series' power becomes available to them.