At this point in time, I would be under the assumption that as soon as anyone buys a Switch, the Switch Pro or some "definitive" shit will be out shortly.
Remember the Unown Ruins in Solaceon? You could just stop and complete that sidequest for the Ruin Manic by Veilstone.
Speaking of Veilstone, DPPt were the last games that rocked the slots, iirc. Good luck to you on that shit, especially the Explosion sidequest there, but be lucky and hook yourself up with quality TMs and items early.
Overall, just visiting new areas was my favorite part about old Pokémon games. I can fondly remember being amazed as a kid, seeing videos of dudes going to Birth Island and Naval Rock in FRLG, and going to the same two plus Southern Island and Faraway Island in RSE. Even if they're glorified legendary areas, just going to a place with a memorable name just has that charm.
And going back to Gen 4, that's what made it so special to me: the map updating most of the time with these new areas. That route where you activate the Shaymin event? Just a nub on the northern of the map until you do, and suddenly, there's this long path added all the way until you reach the Flower Meadow. And same things applied to Newmoon and Fullmoon Islands as well. Just letting players see that they've reached certain points or can even go to certain places, in any regard, is what makes a game special to me.