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Pokemon games will never have good post-game again because kids don't care about it.
The battle frontier and such competitive battle modes are not appealing to kids. They are (or were) aimed at us the hardcore Pokeautists.
Since gen 6, they've made it clear that they have no intentions for the game to keep going after beating the league. It's too much effort that will go unappreciated because casuals don't give a shit about it.
>new route
>hour long side quest
>battle tower
That's all the "post-game" any game will ever get from now on. Get used to it. It's been like that since gen 6.