The title basically sums up my idea. Imagine an entire region that takes place underwater! I imagine everything would be concealed, much like Bioshock, except you can explore outside and into the water to get your water types, maybe with the HM Dive.
I only have a few ideas for something like it, namely that it might be called Pokémon Atlantis, and that the evil organization would be called Team Trident. I also like the idea of this team specializing in Ice types.
I'm not planning on making a game like this any time soon, what with Pokémon Nebula's current development, but I would love to hear some of other people's ideas for the game. Thoughts? ^^
HMs are old news but I actually do like the idea. It'd be neat to explore the lore of the region- like why it's underwater in the first place. Maybe it was built to be a Libertarian paradise like in Bioshock, or maybe by some ancient civilization?