I've been watching a Let's Play of Pokémon Emerald over the last few days, and I started to think about things that could be changed/added to a remake, or maybe even a sequel to RSE.
To change up the last 30% of the game, I would add many more sand banks, little islands, houses and grass/"deep sand"(like in the desert) to Routes 105-109 and 124-131 to make these routes more varied. There could also be currents, but more along the lines of the cycling road of Kanto (where you move really fast if you move along the route but you can slowly move against the stream).
I would also add at least the following Pokémon to the Pokédex:
These additions should deal with the lack of variety of Pokémon being found in the later stages of the game (and lack of ice types in general).
The ice and moss rock would be in the Shoal Cave and Petalburg Woods (maybe in an area that's closed of until later so the Pokémon aren't super weak). The magnetic area would probably the Meteor Falls. Most side areas could be expanded and the leveling curve could be made a little steeper.
Among other features, Streetpass/Spotpass Secret bases! I'm not sure what I'd do with the Altering Cave, maybe use it for extra postgame legendaries or something like that.
For the story I would keep all the events from Emerald, just make the respective team do all the bad things for some reason. Or maybe just have a sequel to keep down the amount of Water types.
So, what would your ideas for a potential RSE remake/sequel be?