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Indigo was barely more than half the length of the succeeding generations. There is nowhere near enough content in the base games to drag out for three years without having to make shit up (which mostly means recycling forests ad nauseam) on top of almost completely ignoring the story from the mainline games, which also means no supplementary material or expansions of lore or world-building.
The anime does a great job at making the world of Pokemon look fucking boring.