Currently, there are six Pokemon that require “Walk with your Buddy to evolve.” That’s Eevee, Feebas, Mime Jr., Bonsly, Happiny, and Woobat.
Pokemon Go Buddy Evolutions
Eevee into Espeon during the day and Umbreon during the night. It requires Eevee as Buddy Pokemon 10km
Feebas into Milotic. This Pokemon has to be set as your Buddy and walk 20km
Mime Jr. into Mr. Mime. It requires Mime Jr as Buddy Pokemon and 15km to evolve
Bonsly into Sudowoodo. It requires Bonsly as Buddy Pokemon and 15km to evolve
Happiny into Chansey. It requires Happiny as Buddy Pokemon and 15km to evolve
Woobat into Swoobat. It requires Woobat as Buddy Pokemon and 1km to evolve