How does Bramblin evolve?

I can’t figure it out. It tells me I need to finish a Challenge with Bramblin as my Buddy, but there is no Challenge listed… Did Scopely mess up again?

You need to walk 20 km with it as your buddy. I get that same message and had to look it up, as there’s no indication on that menu. I haven’t tried setting it up as my buddy yet, as I haven’t found one worth the long walk…

(That error appears to me with another pokemon I want to evolve, I forget which one it is now, will have to look it up…

Edit: It’s Dipplin!)