The only MAJOR use of these would be for the Guts etc. Pokemon
Like a Conky with one of these, the Red Prism for instance would definately make Conkeldurr a much more viable Guts user.
then also with Rest users for the Early Bird one
The other ones though are kinda a little bit redundant though I think that if some of these were to be used then they would all have to be implemented. Overall some nice little niche items that could make some sub ou pokemon share a little bit more limelight.