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Pokémon Distorted Diamond and Distorted Pearl.
It's not remakes, but actually an sequel set eight years after the events of Diamond and Pearl. Occurs at the same time as Sword and Shield.
The main plot involves Cynthia, Anabel and Looker collecting evidences about why people are acting strange - rampaging and creating prejudice against the other. Even some Gym Leaders behavior has change, like Maylene don't controling her angry.
Cyrus return as a redeemed guy, having growth his own perception of the world, and become member of international police. You just get involve after your rival personality change completly.
The plot involves an subtle scheme involving manipulate peoples emotion with devices created by Charon called Rotech and Rotom TV. Charon become famous and influent after partially creating the Rotom Pokédex and the Rotom Phone, but is secretly working in a revenge to rule the region.
He recognizes that can't destroy the emotional world, different of Cyrus, and try to manipulate it. The device, that is a Pokétech with Rotom, can influence people to change behavior. Charon has created a greater transmission station on the top of Mt. Coronet, to emit a signal that enable all rotom techs to control people in the region.
The plot twist is that a strange, dark storm, appears in all the world and in Sinnoh it potencialize Charon's device. The energy open a portal to an distorted world - and Giratina free from it. It was dynamaxed by the strange storm and start to destroy the region. So you and Cyrus need to reconstruct his old machine to bring Dialga/Palkia back to stop Giratina.
After the central events of the game, you need to help the citizien to reconstruct the region. The games are full of sidequests about this.
