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the problem with threads like these is that half the discussion is defining eras by quality and the other half is defining eras by design philosophy. and i think the split between saying gen 6 or 7 is the start of nugen pokemon demonstrates this plainly. gen 6 is plainly worse than what came before it, but it’s still the same formula the series has been using since gen 3. gen 7 is about the same quality as XY, but the design philosophy has shifted drastically.
with that in mind, here’s how I’d group the generations.
>Classic Pokemon: 1 and 2
>Old Pokemon: gens 3,4, and 6
>Gen 5: gen 5
>NuPokemon: gens 7 and 8
>Modern Pokemon: gen 9+