I really miss being able to rematch regular trainers. It gave you reasons to go back through places you've already cleared, and made the world feel more like a living, breathing place. It was fun to see random trainers' teams improve every time you battled them, and was a good way to gain EXP if you needed it without having to mindlessly grind on wild Pokémon. GSC started the concept in a rough, but cute and engaging way, then RSE expanded on it by making more than just a couple trainers per route rematchable, and not being tied to the phone system, then DPPt took the concept even further by taking the Vs. Seeker from FRLG and making it more easily farmable. Then BW comes around and the feature is nowhere to be seen at all? Hope you enjoy fighting the same daily rotating trainers with the same exact teams in the baseball courts and your two shitty rivals. The only two times this feature has returned was when they remade the games that originally had them in already, so then that brings up the question, why not add the feature in the new games?! Scarlet/Violet especially could've done with trainer rematches as currently, you're stuck with the shitty school tournament or Team Star Captain rematches, and the world feels really dead with not much to do after your initial visit.