The ending of Pokemon Legends Z-A tied up a bunch of plotlines and closed the book on many characters which will be explained below.

Pokemon Legends Z-A delivered a climactic ending while tying up many loose ends. At the same time, it still left enough room for speculation and debate on what will follow next with the Mega Dimension DLC.
This article will naturally contain story spoilers for Legends Z-A, so proceed only if you want to know about the same.
Pokemon Legends Z-A Ending Explained

How To Reach the Ending of Pokemon Legends Z-A
You have to proceed with the main missions to reach the ending. Naturally, you will face many Rogue Mega Evolutions on the way until you reach Mission 36, Operation Protect Lumiose.
In this mission, the final boss fight of the game will also take place, against Hyperrogue Ange Floette. During this time of crisis, Zygarde will Mega Evolve and put an end to this threat.
The Ending Credits and Cutscenes

Lumiose is seen recovering from the aftermath of the threat of Ange and the destruction of Prism Tower. All the trainers who helped out against this threat are seen helping out in the reconstruction efforts.
However, the major event during the ending would undoubtedly have to be the death of AZ. The immortal old king of Kalos has finally been laid to rest. After all the goodbyes witnessed by AZ, he was finally the one to say his goodbye.
However, in the wake of his death, Team MZ remains strong and vows to continue the mission of keeping Lumiose safe and achieving harmony between people and Pokemon. You can say some farewells before departing with your friends. You will also see Lysandre in this cutscene, who watches as Team MZ says their farewells.
The Truth About Taunie/Urbain
Sometime after the final boss, you can also take part in the Infinite Z-A Royale. You will have to participate in 15 ranking matches to unlock a cutscene. Here, the truth behind your rival will be laid bare.
You will find out that Jett is the grandmother of Taunie or Urbain. Moreover, Jett is soon thinking of stepping down from her position as president of Quasartico Inc. She will enlist your rival in stepping up as the next president, which they will agree to. You will also receive AZ’s Eternal Floette’s Poke Ball from your rival.
The main missions after this will let you catch Xerneas, Yveltal and Zygarde one by one, and even have a battle against Lysandre and Zygarde.
How Does the Ending of Pokemon Legends Z-A Lead Into Mega Dimensions?

At the moment, we do not know much about the story of Mega Dimensions. However, Hoopa is likely to play a huge role if the trailer is to be believed. Moreover, if Hoopa is significant to the story, Hoopa Unbound will also surely be important.
However, at the moment, it will be difficult to speculate on how the ending will tie into the start of the Mega Dimensions DLC story. For now, we just know that Lumiose is safe from the threat of Rogue Mega Evolutions, and Team MZ will ensure that harmony is achieved between people and Pokemon.

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