Things I do NOT want:
-Apricorn balls being removed (the pokemon you caught them with could just be "recoloured" into normal pokeballs by default when traded to D/P/Pt or not allowed to be traded if a pokemon is holding one).
-Crystal events and features not being included (I could understand if the Suicune story wouldn't be included, although I hope otherwise).
-Terribly low leveled trainers, gym leaders, everything.
-A vast number of 2nd generation pokemon being only available in Kanto. Umm, can I catch certain Johto pokemon in their own region, plz? Kthx.
-1st generation Pokemon overshadowing 2nd generation Pokemon in their own region (wild, in-game trades, everything). Basically, too many Kanto Pokemon in Johto and too many Johto Pokemon in Kanto.
-Johto gym leaders, 2nd generation members of the Elite 4 (Will and Karen) and Johto in-game trainers using mostly Kanto pokémon. What happened to representing your region/the region you were introduced with?
-The exclusion of 3rd and 4th generation pokémon that are related and linked to 2nd and 1st generation pokémon, and also the two 3rd generation Unowns (? and !) not being included. They should all be included.
-No gym leader rematches.
-No updated Johtodex (which would be; 2nd and 1st generation pokemon, the 3rd and 4th generation pokemon that are related and linked to them, and all their different forms. Basically just a simple "add-on and upgrade", as I doubt they would remove any pokemon that were originally in the Johtodex before).
-No appearance of the opposite gender that you didn't pick. They had both rivals in D/P/Pt, it should happen in Hg/Ss as well.
-The Unown dex removed.
-All 3rd and 4th pokemon that are unrelated or unlinked to any 1st and 2nd generation pokemon available in the game at all (apart from possibly a couple of event pokemon). That's what R/S/E/D/P/Pt are for.
-That Neo Kanto region at all (just because I know it would most likely be included, doesn't mean I want it to be at all. Seriously, if this "two major regions in one game" idea was as brilliant as many people think it is, how come it wasn't in any other games after GSC? Because Game Freak must have wised up and realised it wasn't such a fantastic idea after all. >_>).
-I do NOT want to see no expansion on Johto, and instead just the same small sized region we got back in GS. If Crystal can add a couple of new areas, this can add many more new Johto areas. There is no excuse to not greatly expand on Johto at all.
-Bike dismantle when you go through a gatehouse.
-Surf attacking your other pokemon in 2-on-2 battles.
-No new radio shows in addition to all the ones from Crystal.
-Laggy game speed from D/P (I'm not sure if they have fixed this in Platinum, I haven't played it yet).
-Constant weather in just one place. If weather changed all around, that would be great.
-The Pokégear radio automatically turning itself off when you enter a new town, city, route, building, floor, etc.
-Calling out attacks, 4 regions and any other gimmicky, god-awful ideas that are definitely not going to happen.
-Orange Islands (anime filler arcs are uneeded in main, canon games).
-An endless Items bag instead of an Items Storage in the PC (I'm sure they could just include both...).
-Removal of Red Gyarados. Unlike "Neo Kanto", this was actually a pretty important part of the game's storyline.
-No new Safari Zone (Every major region has a safari zone, except Johto).
-Sevii Islands (The Sevii Islands in Fr/Lg were just fine).
-Honey trees. Although I'm sure they could have both these and Headbutt trees, I prefer using the Honey trees in Sinnoh. Headbutt trees however should be available in Johto.
-Not being able to evolve your 2nd and 1st generation Pokemon if they couldn't evolve in the original G/S, until you've beaten the game. An inappropriate and horribly obnoxious feature that shouldn't have even been in Fr/Lg.
-The uneeded "automatic" text that was in D/P (again, not sure if they've removed this in Platinum).
-Crappy sprite animations. If they could manage the perfect ones that were in Crystal and when your pokemon get registered in D/P/Pt's Hall of Fame, then they can do it in Hg/Ss as well.
That's all I've got for now.
I don't like the new fishing thing. I liked it when you don't pay attention, but you still could fish.
Yeah, I agree. I wouldn't want to see that either, I prefer the old-skool way.