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Pokemon used to have the Zelda cycle problem.Gamefreak like Zelda would add new gimmicks(as well as remove some to the point of being a detriment at times) to each title. Fans would often bicker about which title did it best but at the end of the day you can pick up any entry and have a blast.
Pokemon pre Gen VI (debatably VII if we only include XY) had no real "bad game".Its not like that anymore. If you are an actual fan of pokemon you will dread playing the modern entries as they stand against everything that made pokemon good to begin with(interesting pokemon designs and lore, exploration and actually CATCHING THEM ALL)