I'll do post-game story content and unlocked routes/areas, if any.
I get my in-game party up to level 100.
In Leaf Green, Platinum, and Y, I've completely filled out the Pokedex. Nowadays, I don't bother with that anymore. At best, I'll take the "Erika" approach to the Pokedex, based on her after-battle quote:
![[PokeCommunity.com] What's the postgame like for you? [PokeCommunity.com] What's the postgame like for you?](https://data.pokecommunity.com/attachments/85/85395-abc00ebbf66eca34dfcd67d411cc1b03.jpg)
Basically, I'll attempt to fill out the Pokedex except for the ugly (IMO) ones.
I used to breed and EV train for online battles, but I haven't been bothered to do that since 6th gen. I'll give the battle facilities a try, but I don't think there's one game where I've beaten all the facility bosses. RNG strongly favoring the CPU and all that.
I've never been compelled to shiny hunt, tbh.
Honestly, I don't have the time to do post-game stuff as much as I used to. Other, better quality games get my time and attention.