is getting umbreon pokemon go even possible at the moment?

if you ever want the other one, Sakura is the espeon name, same once-per-account rule. and look at the map before you hit evolve, it has to be in its dark night mode or you get espeon.

yes, still the same method. make eevee your buddy, walk 10km with it so you earn the 2 candy, then evolve it at night while it's still your buddy. daytime gives espeon instead. if you just want one fast, renaming it Tamao before evolving works, but only once per account.