I can see how this could be put in without being immersion breaking, too, as some kind of unofficial gym (like the Fighting Dojo in Saffron City) with trainers who, rather than having teams of Pokemon based on a single type, have teams based on a single attribute (reflected in-game by their EV yield), which could allow for some cool thematic teams but without the inherent weaknesses of a monotype team. The regular EV training rooms in Rejuv feel too much like a mod than an immersive part of the world.
