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For Gen 6, I'd want Pachirisu's cry reverted, less availability of booboo keys and smogonsword, old exp share, and more emphasis on sky and invert battles.
For Gen 7, maybe a gen -1/prequel where it's in a different region and tells the story of the first pokemon (which could be a mix of all generation pokemon, excluding dark, steel, and fairy types) and domesticating them. This could implement more use of apricorn balls, pokemon following you, amie, and horde battles.
For Gen 3 remakes, I just want a little more post game content relating to other regions, available events for the event mons, and quality sounding trumpets.
And in general, Pokemon Bank.