I understand some people like to exercise patience and determination by grinding. But I'm feeling that is more niche than common among players. What drives Reborn is its story. I learned how to IV breed and EV grind just to keep playing Reborn - not to lose to Ame & co and engage and solve the challenges and puzzles you/they've thrown at us, and let myself be immersed in the story and world that Ame has so beautifully built and given to us - free of charge! Having to grind (and I absolutely detest the time lost for inherently meaningless grinding) was part and parcel of the challenges of the game so far. "You want to see more? Put in the effort for it!" But this is slowly turning into something like a Pokémon-SAT now. You grind, you take the test, and if you want a good life/keep playing you have to pass the test, but the test and its grind are completely irrelevant to life/story. We play game precisely to get away from that aspect of life. Please, just make sure that you don't end up doing that in Reborn. Reborn means something, a really good thing. But falling to the trap of throwing harder grinding tests at the players can diminish this meaning. Please don't let mind numbing patience become the defining characteristic of the game.
I gave up playing Rejuvenation because of this. (Along with the Wheel of Time, it remains the only thing I put down in frustration, and I've stuck to the end of some really bad and cringy stuff in my time.) The story and writing simply aren't good enough to merit wasting so much time on grinding. Reborn's story was worth it so far, but you've already promised us that we will fight some PULSE-mons with EVs higher than what we can reach. While it isn't a cheap challange - PULSEs should have something to them - it is quite certainly not a challange I am looking forward to. It seems like it is just going to be some nasty admin battles to get over - as if they weren't hard enough already. And grinding in Reborn is hard. Another example of something similar is the Poipole challange. The game is slowly becoming something that excludes players who aren't obsessed with it.
That said I will finish the game no matter whatever is thrown at us. One does not simply turn away from great work like Reborn.