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See, if it's just going to become a money sink to most players, they can at least make it interesting.
Have a management minigame where you invest in-game money in different parts of a pokémon ranch or whatever, and gain certain TMs or pokémon or rare candies or what have you based on your progress on the different wealth and work distribution and little minigames on the different parts of the ranch.
Or, hell, here you go, the evil teams rekt the local pokéball factory, so now you can invest in the new one. Spend money on different pokéball types to make them a little bit cheaper to buy in stores, and end up giving certain balls boosts in catch rate or added effects.
Why is nobody pitching this stuff?