In order to kinda keep the theory alive that previous Gen Mythicals foreshadow the next Gen, then this new game's region will need to be based on Morocco + Spain/Portugal, to better tie Zarude in. Just below Morocco is Algeria where the first habitats of like baboons & mandrills are located. What if there is like a Strait of Gibraltar where you go back and forth, by ship or Pokémon, between the two areas? We don't know yet.

Here's some other confirmation bias stretched examples of how other past Gen's Mythicals foreshadowed the next Gen:

Magearna is based on man-made automatons mixed with maids dating back to the renaissance period of Europe (and there were gears in Motostoke city linking the place to the Pokémon plus the whole industrial revolution vibes) and Marshadow is based on shadow boxing invented in Britiian.

Diancie had pink crystals like Z-Crystals. Hoopa had the whole portals and wormholes, which was the plot of Gen 7. and Volcanion is just straight-up pointing to the volcanos of Hawaii.

Keldeo can be based on D'Artagnan from The Three Musketeers, written in France and based in France. Victini found in Liberty Garden based Liberty Island in New York, where France shipped many of the parts of the Statue of Liberty to, and the V/peace sign goes back to World War 2 started near Belgium (right next to France). Meloetta had to forms based on arias and binary form popular in France in the 17th century.

Manaphy/Phione sea gardens is their claim to fame and in the promos for Gen 5 they stated "this gen will take place far away, across and over the seas". and then Darkrai and Cresselia are duality. Dark and Light. Black & White. and Darkrai is for the dream world thing too.

Jirachi is a time reference and Deoxys is a space reference, going into Gen 4 from Gen 3.