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80% of those aren’t worth it.
I’d say the only good things are:
Natdex, Triple and rotation battles, Difficulty selections, Game corner, secret bases, and the grand underground.
Other things can be reworked like example super and hyper trainings by removing EV’s and IV’s, any sort of trainer rematches by just talking to the npc trainers later on, or the gen 3 bikes by having all sorts of bike upgrades, and mythical events something you can do without having to go to some irl event.
Other stuff are just outdated, or straight up cancer like Z-Moves for ruining gen 7 comp, and Pokestar studios for having the worst mandatory tutorial ever.