I noticed that all of my Remote Trade-tagged Vivillons, Dusk Lycanrocs, and Salazzles were recently untagged after evolving them to make their trade value more apparent, since the RT UI doesn't show gender or Scatterbug/Rockruff forms-to-be.
Couldn't find any threads about this, but I was able to reproduce the issue on friends' accounts across 3 devices. Probably a bug, unless the RT tag operates on an assumption that players would only evolve a Pokémon if they decided against remote trading it.
If you've evolved any RT-tagged Pokémon, check your tags!
by Klecktacular