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Honestly depends on how you look at it.
I, personally, would say Gen 2 and the early 2000s were the golden age of the franchise, especially in the west.
Gen 5 brought a fuck ton of new fans to the series, the internet was flooded with fan-art and fan creations and it really sparked a resurgence in the Pokémon "fan community", which might have also been because of the building hype during and after the release of HGSS.