Bottom

Bottom is the main villain in the movie Pretty Cure All Stars DX 2: Kibou no Hikari - Rainbow Jewel o Mamore!. He is a unknown darkness entity who got revived after 1000 years ago and seeks to destroy the world and plunge it into darkness by stealing the Miracle Rainbow Jewel. He has two forms, his astral spirit form and his large gigantic revived form

Reviving the Fallen enemies
In the start of the movie, a purple jewel containing his spirit plunged into the ocean near Fairy Park. As his spirit is unleashed, he then revived the Arch-enemies of the Pretty Cures and made them his subordinates, aiming to steal the Miracle Rainbow Jewel.

Taking over the Fairy Park
After is revived subordinates failed to take the Rainbow Jewel due to all the Pretty Cure's appearance, he himself decided to take over. Bottom arrives at the Fairy Park and steals the clam shell with the Miracle Rainbow Jewel, turning the amusement park evil and splitting all the Cures up. Although it was successful, the Cures decided to get the Jewel back from him. Bottom ordered his minions to stop them at all cost before the jewel achieves it's full power and devour it.

Full Resurrection and Defeat
After Cure Blossom and Cure Marine failed to get the Jewel back, Bottom finally devoured the Miracle Rainbow Jewel and achieved his goal, now along with his minions, they all fused together and Bottom is now fully revived, now resembling a Huge Giant much bigger than Fairy Park or the city and has demonic like head. This causes the Cures to lose all of their powers. He said to all of them that all hope is lost and everyone in the world will be destroyed as his world of darkness will be revived. But due to Cure Blossom and Cure Marine's Determination not to give up in battle and their hopes not crushed, they decided to fight against Bottom using the Floral Power Fortissimo but failed as Bottom is too strong. The Fairies then realized that hope is not lost and with their Miracle Lights, they give all the Cures their powers once again, upgrading themselves into their Rainbow Forms and unleashed their most powerful attack to Bottom. Bottom counters it with a powerful blast but then failed as the Cures' power of hope finally defeated and destroyed Bottom.

Trivia

 * If considered canonical, Bottom is the most Largest of all the Precure Villains ever appeared in history. He is also the most powerful of all the villains in the Precure community since he can be a God-Like Entity like Infinity.