About a year ago I reported a beneficial glitch that allows you to more easily evolve Pokémon with a walking requirement without needing to actually have them as your active buddy.
It's very inconsistent and may rely on the accuracy of Adventure Sync but I was able replicate the glitch again today.
Notice in the video that I have selected a specific Dynamax Woobat, and that the progress made towards evolving it is 0/1km. When I switch my buddy from Slowbro to the same Woobat, the walking that I have done today fulfills the requirement and I am now able to evolve it.
I never did a deep dive into it because I thought it would be patched by now, and I've also moved to a more sedentary job. A more well-written summary I've shared of this glitch can be found at this link.
Basically, it only works for walking requirements, you must meet any additional "adventure" requirements (like Eevee needs you to have also earned two buddy candies with your buddy the day you attempt this) and it sometimes may just not work.
Hopefully this is useful to somebody.
by msnmck