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The problem is that most of this post game content is just a one-off things, once you finish The delta episode you can't do it again, once you catch all the availabe legendary pokemon you can't do it again as well, so what's left? Battle maison, and other pokemon games had more content like bw2 with the like of the battle train, pokemon world tournament, and the white forest black city challenge, pokestar studios etc.
And most of them replayable, if oras and xy did a little more more replayable post game content
It wouldn't be critizised that much in that aspect
