For things that are just too incompatible with the URPG, normal evolution is used. Probably will be the case with Inkay
On the other things:
Sylveon will be another rock that is exclusive to it, just like all the other eeveelutions.
I don't really think that Pancham / Sligoo's evo conditions are too much to ask of people (especially Sligoo's since you can set auto rain with battle rules), but that's just my opinion.