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Pokemon Earth (Zygarde) will take place in Kalos and have an Alola postgame while Pokemon Mars (Marshadow) will take place in Alola and have a Kalos postgame.
Both games will bring the franchise to the NX in order for it to have two regions (NX pokemon rumor)
After you create your own league in SM (chinese leaks), an official league exists in Pokemon Mars with many trial captains becoming gym leaders.
Kalos will have many differences in Pokemon Earth as opposed to XY, such as new gym leaders, environment changes, and gen 7 pokemon.
After their first defeat, Team Skull becomes a more refined organization and manages to gain control of the opposing version mascot for their evil plot
You must capture the version mascot of your game to fight Guzma, who will use the opposing legendary.
In the post-game, you can take the S.S. Anne to travel to the opposing region, where the gym leaders will use higher level pokemon and take on a new battle facility.
This battle facility will have about the same difficulty/entertainment as the PWT or Battle Frontier and will either be in Kiloude city or a post-game area in Alola, depending on your version.
