That's an interesting idea. The key is to have something much more substantial and fleshed out than what FRLG had.
This could be how Eusine appears in the games. Have him appear in Celadon City (his hometown, based on dialog from Crystal) and mention his interest in Suicune and how the Beasts have been spotted in Kanto. After you're done speaking to him, they'll start roaming.
While that works in the context of the story, it makes for terrible gameplay. HGSS could freely trade with DPP from the get-go (even if it was with non-Regional Dex Pokémon), and the same goes for XY and ORAS (with the exception of ORAS-exclusives like Cosplay Pikachu and the new Megas). Besides, Gen 1 remakes will more than likely happen in Gen 7, so they won't even be in the same Generation as the newest Hoenn games.
No matter what happens, I'd like to see how Lance became Champion and how Blue took over Viridian Gym. I'd also like to see Lorelei and Agatha get send-offs that treat their characters with respect and open them up for appearances later on in future games (the postgame Lugia story I posted earlier in this thread is an
excellent one for Lorelei). We'd also see Karen appear and learn more about her and how she joined the Elite Four later on.
(Based on her similarities with Agatha, and the fact that her team is comprised entirely of Kanto-native Pokémon, I'd say Karen's from Kanto, probably Lavender Town or Celadon City. The Psychic Clown, on the other hand, is probably from Johto, and I say screw him. He's not worth fleshing out, to be honest.)
Well, the anime treated the Shamouti Island and Whirl Islands Lugias as two different Pokémon, and since we're already borrowing from the anime, there's always that excuse if it comers to it.
Well, I didn't say anything about ditching the other Day Care. The main thing is to have a place where you can breed before beating the Elite Four.
Well, there's an easy explanation for that, albeit a dark one--The SS Anne wrecked on its way to either Slateport or Lilycove (possibly caught in Hoenn's weather wars), and Looker hit his head, fell overboard, and washed up onto the shore of the Battle Resort (hence the reason why he had amnesia). This also explains why we never saw the SS Anne again (not even in Gen 2, where the SS Aqua replaced it).
She was in
every single DS main series game, including
ones she had no business being in. She needs to take a break and let other characters have the spotlight for a change. I honestly don't want to see or hear about her again until Gen 4 remakes. (Which won't happen for a
long time.)
While we don't know how many years
exactly separate Gen 1 from Gen 5, Iris probably isn't any older than a toddler, either way. That being said, it might be cute to see Drayden and a very young Iris appear at either the Indigo Plateau or even the
Fan Club in Saffron City and portray Iris as being a huge admirer of Lance (even to the point of crushing on him).
Wallace definitely deserves more love, and if Cynthia could appear in HGSS, then I don't see any problem with him being in Gen 1 remakes. I wouldn't be opposed to putting a Contest Hall in the islands, where we could see him, along with Daisy Oak (who was said to be a star coordinator in FRLG), Jasmine, Whitney, and Pryce.
As for Alder and Diantha... We'll, they're still better than Cynthia. Maybe appearing in some other games would help flesh them out better (especially the latter).