Putting the class in class warfare
I could see them return Hidden Power as a DLC exclusive move. Possibly expanded to be able to be Normal or Fairy typed.
They'd need to rewrite the way Hidden Power calculates its type for either to be possible, which to be fair would be a good thing in and of itself. I think Normal-type Hidden Power is kind of redundant and unnecessary though. Normal doesn't offer great coverage, hitting absolutely nothing for super-effective damage, and nothing would really have any use for a 60 BP Normal move. Plus Round already exists, with the added bonus of being a sound move that ignores Substitute.