I’ve read on the wiki that the EV Trainer could be upgraded after the fourth and eighth gym badges, however, my EV Trainer remains the same from the beginning, and I already have 8 badges since then. Every time I try to access the “functions” list on the Tablet it says that I have already bought all the possible upgrades so far, even tho I just bought the first one.
I also tried to remove and add the NPC again, but that didn’t change anything, I always get about 18 EVs at the end of the training by using Macho Brace, don’t know if it’s the best I can get.