Because they simply liked making 2D.

>>715856219
>The low quality can be mostly explained by Game Freak pouring their hearts and souls into making B/W/B2/W2 and then putting next to no effort into X/Y and having X/Y sell MORE.
New hardware, updated graphics, better multiplayer, and a really popular battle system.

>and make the games even easier (to the point of parody).
This is not true anymore.