I wouldn't want any of them to evolve tbh. :/ Dunsparce hasn't evolved in the 3 generations he's been through, and I'll bet it's too late it we evolve him in his 4th. He's pretty original and unique, so I really wouldn't want to evolve Dunsparce at all.
Bah, Cherrim. Pretty cool Pokemon. When I heard of Cherubi being introduced, I was like, baww ;____;. Cherrim didn't need a pre-evolution, it wasn't that strong to need one. Cherubi was pretty unnecessary. And Chatot... it's a really unique one of those mimicking Pokemon. Both of them just have that "quality" to them that just tells me that they should be left as is. There really is no point of evolving them, imo. They aren't the kind of Pokemon that are supposed to be the dominant forces of the metagame, they're just one of "those" Pokemon that are just in the series for the fun of it. :(