>>50638029DP was where the franchise started to stagnate.
BW was where the devs became fine with cutting key features
XY was where the games started replacing content with flashy gimmicks. it's also where casualisation went to a stupid extent
LGPE was where the games started to not give a shit about connectivity between gens
SWSH was where they actively lied to their playerbase before release, and Home became the scummiest garbage
SWSH was also where they started paid DLC after giving us the game with the least content in the series
BDSP was where TPCi actively said "we don't give a fuck about this game haha"
PLA was where they removed multiplayer for the first time
USUM is the last good Pokémon game, because it is the last Pokémon game you can consider like the definitive version at the time.
LGPE, SWSH, BDSP, PLA, and SV if it has dexcut, are just deliberately bad Pokémon games by definition.