It could be that, despite the writers not bringing up a lot, these references are getting free passes because they are all Gen 1 related, and Alola is pretty much a region idolizing Gen 1.
So it's not likely any other reference will get through unless the S/M game content dictates it (in other words, past characters like Cynthia showing up).
They name dropped Honeymitsu in episode 4, and that's from BW.