For the palico armor, you should see it under HR Standard Sets when you go to forge armor for it. There's nothing special, just a regular set of armor. Have you killed the HR version of Kadachi and gotten some body parts? It should appear.
Oh, I see yeah I kinda figured that's how it works I just really wanted confirmation the set exists and is available - I know it's nothing special just the cutest of the bunch, hah!
Well, I probably didn't kill that one on HR - I may have trapped it though, thing is I was looking in the missions / investigations (?) you can add, I just didn't see it, only low ranks... Low rank is blue star, high rank is red star, right?
Also almost obvious but yeah, I just didn't find a "hunt a Kadachi" one, have to look again...
Also what sucks, I noticed some sets aren't sets, they're just parts, like the scientist one is just glasses, lol, I'd want the whole outfit, looks like they didn't even make a whole set, pretty strange.