I'd like to see Gym Leaders/E4 roster changes... like for example I can see Norman as the Hoenn Champion considering how at the beggining of the originals he was on the news and stuff. Or someone to take Watson's place as gym leader even if its a new character or something.
I really hope we get more use out of the Space Station other than Team Magma stealing rocket fuel to blow up Mt. Chimney. Give it some sort of use, like Jirachi or Deoxys.
Obviously, like many of you, more Megas, pokes I believe deserve a Mega would be the other 2 starters, Metagross, Milotic, Flygon, Arcanine and pleeeeease oh please a Johto starter Mega, prefferably Typhlosion but Feraligatr would be nice too.
Since it's going to be a remake, not a sequel then I guess we'll be stuck with pretty much the same storyline but I can really see some improvements to it regarding Team Magma/Aqua like making their conflict with some more passion in key encounters like the sea cavern and Mt Chimney or Mt Pyre...
Different pokedex... having 3 more generations since RSE should make the gym leaders and E4 more challenging since it would give them more variety regarding their party, it would be nice to see Glacia with more pokes other than 2 Sealeos and 2 Glalies, or Phoebe with something else other than a team full of Bannettes and Dusclops, and even Drake with more dragon types in his team! Its amazing how the weakest E4 member is the one that doesnt have 2 of the same pokemon in his team #RespectSydney lol
The battle frontier should return but I really want to see the PWT in there too so why not change the Battle Dome for the PWT?
Another region, I really loved GSC because I could go to Kanto and play through it, sure not without a storyline but it really felt good, it gave me something to do after beating Lance and I really hope they add another region... i know it wont happen cuz if not then it wouldnt exactly be a remake now would it? But I really wish GF would freaking hear my prayers and do as I say. Since its kinda obvious that wont happen since we already would have the Battle Frontier to explore after the credits roll, I wouldnt mind seeing at least the Sevii Islands return or add a few more routes that have some sort of backstory to it that are linked to other regions like Sinnoh or Unova...
Rival enhancements should be made, Brendan/May and Wally just didnt do good, I mean you cant even see Brendan/May's starter fully evolved -.- more frequent rival battles would be nice and throw Wally in the mix! You only get to battle him once before facing him in Victory Road.
I think thats all I would ask for in a remake... and I know this really isnt exactly on topic but thinking about all of this made me think about the endless possibilities on a RSE sequel like for example, to name a few like seeing the Admins trying to put the teams back together (Neo-Magma/Neo-Aqua), Phoebe being in charge of guarding the orbs instead of her grandparents, Tate and Liza having a big rple on the Space Station being all grown up and stuff... you know, mix things up a little, it would be super fun to see a sequel, but anyways its safe to assume or say OR/AS will be remakes