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Gold and Silver were the most impressive games.
>First main line games in colour
>Day and night cycle made games more immersive; e.g. fun to see the passage of time in-game when you're a little kid on a road trip
>Based MIDI music
>Two regions - a meme now, but mindblowing for literal children in the early 2000s
>Backwards compatibility important for continuity; kept Red/Blue relevant for longer than they had any business being so
As for autistic game play advances:
>Added 'mon genders
>Added breeding
>Split special stat
>Added dark and steel types
>New evolutions for old mons
Don't forget:
>Crystal version first to add fond series bonuses like Battle Tower, sprite animations, and playable girl
So it's easy to shit on Johto because it's small and uneventful, but for their time, the second generation games were the most impressive. Fwiw, I'll take a cozy small region like Johto over any of the successive regions chock full of dumb weeb setpieces and silly towns.