Some new info from a leak set for some time after the Feb trailer

The Majins are confirmed to be the central antagonists of the games; they are angered due to being forgotten deities and are trying to drive humans off of the islands also because of habitat destruction

Essentially they are more chaotic Tapus and each island has their respective Majin of a certain type and a color not normally representing the type

Orange - Electric
Light Blue - Fire
Indigo - Ice
Green - Ground
Red - Psychic
Yellow - Bug

The Majins curse random pokemon of their respective type to fight for them unwillingly; as seen with the pulsating orange Pikachu gif
Although some strong pokemon are instead convinced by the Majins to fight for them willingly; the Majin soldier pokemon instead gain a new form highlighting a key visual element they possess similar to mega evolution; the Majin Soldier forms look more elegant and refined than standard megas, similar to ancient asian general uniforms


Your goal is to go to each island and use a device that conjures the Majin to the physical world, since they hide in a different realm; the frightened Majin will then fight you and when beating the Majin you gain access to the Soldier Forms that Majin gives
Each Majin has a secondary Ghost typing to the type they represent when summoned; there is a leader Majin and its represented type is Normal; when conjured it gains the secondary Ghost typing and it has yellow, black, and white coloring similar to Regigigas and Arceus

This entire plot line of the Majins is the main one, and the antagonist hotel team are the ones responsible for unleashing the anger of the Majins

With each Majin you defeat, they become locked up in special cages where you can interact with them at a kind of underground base owned by the hotel guy

The White Normal Majin is the final boss; it breaks out the caged majins to help it; when you defeat it you complete the main story/game; champ fight happens before this