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Burnout. I frankly can't believe anyone playing Pokemon fiendishly for a decade or so straight, let alone longer, has only just now snagged on the 3DS games.
But the usual suspects;
Increasingly linear ("theme park"?) regions.
Typically lesser difficulty in a series already for 7 year olds.
Pokemon's finally "getting a story" and how it ultimately became a liability.
Bloat (particularly most elements since Gen 4).
...don't help. And if you haven't played Pokemon long enough to have a hard burn out, they probably account for it.