How would you feel if game freak made a region based on Mexico or Spain, it has many of the same points as India for a candidate, a rich cultural history, interesting landscapes, heck, you could even have some really cool regional forms, like a water grass type maractus based on cacti that store water, or a chatot evolution based on a macaw, or even a fairy type happy phantump & trevenant based around a pokemon themed festival similar to the day of the dead. Sorry, I went off on a but of a tangeant there, but something like that would be rather interesting, just some food for thought.
I don’t know; I feel like I should have something to add to this but… um… well, yeah, there’s all kinds of cool things you could do with a Mexican region. I’m a history and archaeology guy so obviously the first thing that occurs to me is that it would be cool to have some Aztec-, Toltec- and Olmec-inspired stuff; maybe a Nosepass regional form (or a totally new Pokémon) using the Olmec heads from La Venta, or an Aztec “jaguar warrior” Pokémon, or a legendary “feathered serpent” (or even just a resplendent quetzal Pokémon). Modern Mexico would have a lot of cool natural and cultural inspirations for Pokémon too.