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What gen 8 needs is optional areas to explore in between road blocks and even areas that expand once it's post game. I mean think about it a giant Cave with an entrance to some ruins but you can't access till after you beat the elite four it opens up and there's tons of strong pokemon with an ancient legendary in slumber. Maybe even an area where a bunch of elite trainers hang out and you can go there for a tough challenge but these trainers are rouge sort of like the battle square in pyrite town so they use some really unorthodox pokemon etc.