>>543135422017/2018 when Zoomers first invaded 4chan en masse is when Black/White apologetics first became a noticeable thing.
If you want the year when it seems like somehow Gen V is widely accepted as good, I couldn't tell you. The rhetoric behind whether just BW2 is good or if BW is also excellent is also hard to pin down.
In any case it's still mostly just unovaborts who speak highly of Unova games.