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For me, Gen 4 was not bad but didnt kept me interested either. Im not even gonna bother with anything newer considering many factors. People gonna heavily disagree but i think since Gen 4 and onward, the main series lost all meaning, i mean they lacked all that made them what this series is all about, suddenly we have high fantasy plots, disinteresting characters, lack of challenge, weird pokemon designs, cut features etc. The older games were good because they had the same selling point, it was a grand adventure that every step of the way you found something new and interesting, nothing was streamlined, nothing was easy to the point of mashing "A" away, and every bit was memorable. I might be wrong but tell me, which gen is the most memorable to you? Im sure its some Gen 1-2 or even 3 stuff, the newer games just dont seem to have that charm and they're so different now.
tl;dr Newer Gen games changed the series so much to the point of being "not pokemon" anymore and it sucks ass.