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I've noticed a pattern, and I'm sure I'm not the only one here to do so:
Odd numbered Gens (1, 3, and 5) so far have self sufficient regional dexes while even numbered Gens (2 and 4) offer relatively few region-specific entries and fill up their regional dexes with pokemon from previous games. With the numbers they've announced for Gen 6, it seems this pattern will continue.
But here's something I haven't seen brought up yet. In Gen 2 and Gen 4, while there weren't as many new pokemon, something they DID do was make some pokemon easier to use in your playthrough than they had been in their original games, either by tweaking when they learned certain moves, or simply making them available earlier in the game.
For example, in G/S/C you're able to catch Exeggcute before you get the 3rd badge where as previously it was unavailable until much mater in the game. Further, Exeggcute learns a STAB move by level-up in Gen 2 while in R/B/Y it only learned Psychic, Solar Beam, and Mega Drain via TM.
In D/P/Pt you're able to catch Ponyta very early in the game, and it learned useful things like Flame Wheel early on by level-up as opposed to in it's original game where it wasn't obtainable until very late in the game and doesn't learn any new moves until Tail Whip at level 30.
So my question to you is this: What older pokemon would you like to see get this sort of treatment in Gen 6? What pokemon would you like to be able to catch early in the game so you can actually use them in-game? And what pokemon would you like to see have some quality-of-life style adjustments to their moves learned via level-up?