>>33808229ORAS is the game you just leave it off in, especially if you're going to be catching things a lot. The curve is better balanced than the original RS but it doesn't really factor in the extra EXP the EXP Share generates. XY and SM you turn it on and off as needed to keep up with the curve, though if you're more knowledgeable about what you're doing, it's totally possible to leave it off, or on the whole time if you aren't the type to fight every single mook trainer.
Of course though, if you use it as intended, to let you cycle entire teams regularly, you can usually leave it on.
