The Pokemon Refresh mechanic is basically Gen VII's version of Pokemon-Amie, and probably shouldn't be allowed for similar reasons. The Exp Share is still a thing, but it works just like it did in Gen VI. The Z-Moves, from my experience so far (almost done the second island), don't seem overpowered. They seem to be on a lower power level then Mega evolutions, and since you allow those, Z-Moves should be fine to keep. I've been limiting myself to one mon using the crystals at any time, but that's just me. Other than that it's pretty standard, no major changes.