Personally i’d say XY and gen 6 in general, mega evolutions are excellent and they made an actual effort putting lore into the games (plus i’m french so i may be biased because kalos), ORAS were imo the best remakes ever and are exactly what a remake should aim to be.
For me, it will always be first and second gen. I remember playing Pokemon blue on a very bare bones emulator before it released in my country or at least before I became aware of it. Later went on to get red, yellow (the one with Pikachu following you around) and silver.
The gens after that kind of added so much stuff that I wasn’t interested in at all and that seemed to clutter up the experience. But maybe I just grew out of the franchise as well.