>>26812076A soft reboot to the concept of Megas. They still exist, but only for nonlegendary Pokemon with at least one normal evolution, with the exception of Kangaskhan. So Mega Pinsir, Aerodactyl, Heracross, Mawile, Sableye, Absol, and Audino are now regular evolutions.
Also, there's only one Mega Stone now. Any Pokemon that can Mega evolve and holds it can Mega evolve.
Vastly expanding the concept of rideable Pokemon. Any Pokemon that's sufficiently large can be ridden at any time. There are items and areas accessible only with ridden Pokemon, as well as a fleshed-out racing minigame.
The return of soaring, and an equivalent ability for exploring underwater.
A fuckhuge diving area with lots of grottos to explore.
~90 totally new Pokemon, 10 intergenerational evolutions for Lapras, Farfetch'd, etc., and 20 new Mega evolutions, with good to great designs all across the board.
