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I've been thinking of interesting things to add to the post-game and came up with this idea: There's this Trainer Academy you can visit and take tests in. If you clear a test, you will be granted a trainer class title, like "Ace Trainer" or "Bug cathcher". The tests would be different for each trainer class. To become a bug catcher for example, you could have to cath a certain number of bug types in a limited amount of time or beat some trainers using only bug pokemon. When you recive a trainer class title, you can use the sprite of your class as your avatar when interacting with other trainers over Wifi and maybe unlock some wild Pokemon or items at the poke marts. If customization would still be a thing, it would unlock some clothing.
Anyways speaking realisticly, I would like to see a Dark-type gym.