This has been discussed before.
Basically, Game Freak has arrived at their destination of "Comfortable Mediocrity"
By aiming to create none of their games objectively better or worse than the last (This is impossible, but the point stands) while introducing new pokemon and gimmicks, they can simulate innovation, which snares its customers into buying the next game.
1: They hold a universally-loved IP
2: So long as they don't bump up their standards, they can keep making "good" games in comparison to the one that came before (Minimal content-to-last-game ratio aside from new mons)
3: Thus, the elements we wind up missing most from Pokemon are actual gameplay elements introduced to make their broke-ass game seem more playable. (The Underground, PWT, etc.)
Almost everything you love about the actual pokemon games WILL be replaced with something you enjoy less. They will NOT be added back unless a remake is made.
And I will NOT be buying any more pokemon games. I am fed up with this shit.