Pokémon: Astral Eclipse (Japanese: ポケットモンスター：星の日食Pocket Monsters: Hoshi no Nisshoku) is the limited series of the spin-off from the Pokémon anime. It aired from August 02, 2019 to October 04, 2019 consisting of 10 episodes, following the release of Astral Eclipse: The Blinding One.
The series was originally intended to be the third series. It was set to air between November 2016 and November 2018, with a movie finishing the saga in May 2019. The series was cancelled shortly before airing, due to the series going on hiatus. The series was set to consist of three chapters: Sun & Moon, Guardians Rising and Ultra Prism.
The series aired in the aftermath of the events in Astral Eclipse: The Blinding One. Being trasported to "Ultra Space", Lexi and Zinnia discover that they are taken to another timeline dimension in which the events that happened in Alola differ slightly. They meet Looker and Annabel (later revealed to both be the orignal ones, having being transported here when previously investigating Worm Holes), and also come into contact with "Ultra" versions of Lillie, Lusamine and Faba. The girls are left to let events play out as they need, while also trying to uncover the whereabouts of a "hiding" Necrozma to restore the light to their Alola. However, plans are afoot that they are unaware of, leading to it being revealed that Giovanni resides here too, the former mastermind behind Team Rocket and now, Team Rainbow Rocket. He had actually being held captive in Ultra Space and had used his plans by contacting a "friend" (revealed to be Colress who managed to maintain a connection to Ultra Space) to convince Lusamine in the original timeline to have events play out as they did in order to open the Wormhole allowing him to escape. His plan had prevailed with Lexi having come to the new timeline and fought Necrozma, which unleashed the light but also opened the Wormhole. However, in the battle, Necrozma's injuries resulted in a paradox world where both worlds resided together, creating the minefield for Giovanni's plan to continue to be played out with Ultra Beasts being used to test their strengths for Giovanni's further plans, which included freeing his "brothers" also trapped in the void, including Cyrus.
However, due to Lexi and her friends, the Wormholes are closed, with Necrozma locked in Ultra Space, alongside all of it's original inhabitants. Giovanni, in a rage due to his plans failing, set forward a massacre of the Aether Paradise, before escaping alongside afromentioned Cyrus and later revealed Ghetsis - also revealed to be alive.
Lusamine asks the Ultra Recon Squad for help. However, they brush her off, as they’re unwilling to forgive her for her recklessness. Instead, they give Lexi and Zinnia a uniform like their own and send them cross dimensions to their world on the back of Lunala and Solgaleo. However, they have the task of letting events play out as they need to, as they can't allow anyone to know who they are or where they're from. As the duo arrive in the place called Megalopolis, they discover not as it seems as they discover that the people there are the same as in their own dimension. They are attacked by a Nihilego. Looker turns up and reveals he is tracking Ultra Beasts.
The duo's confusion continues as Annabel is revealed to be alive and apart of the International Police. Looker takes Lexi to his hideout. Another Ultra Beast (Kartana) attacks them at Looker's hideout.
Lexi, Lillie and Annabel are revealed to be members of the Fallen after being analysed by Lusamine. The group agree to help with the preparations for the Aether Paradise Annual Fair. At the fair, Lexi finds Faba stealing the Ultra Beasts, and battles him.
Faba's attack continues. Lusamine is attacked by an Ultra Beast and becomes comatose. The fair is interrupted by Ultra Beasts, after being unleashed by Faba under the instruction of Rainbow Rocket. Lexi discovers the truth behind Necrozma's whereabouts and how to get back home.
Ultra Beasts attack. Lexi steals Type: Null and uses him in battle to subdue the Ultra Beasts. Upon defeating most Ultra Beasts, the face of Rainbow Rocket is revealed to be Giovanni (the real, Giovanni) as Lexi and Zinnia face Necrozma.
The battle continues with more Ultra Beasts being unleashed in battle. Looker and Wicke successfully create the Beast Ball using Poipole's research. Lexi and Zinnia face Necrozma in battle, resulting in the two worlds colliding.
The group battle to close the wormholes and set everything back to normal. Angered by his plans failing, Giovanni causes a massacre, resulting in the deaths of many at the Aether Paradise. Ghetsis is revealed to be alive; and the trio make their escape in a helicopter. An incognito Lexi boards a train.