Trainers, Niantic, and Pokemon Go acknowledged the issues about Shiny Galarian Ponyta not hatching from Eggs or Research Breakthrough, Espeon, and Umbreon appearing on the evolve button at the wrong times of the day and Eevee not evolving into Sylveon when using the special means.
Now, one of the three mentioned issues above are being solved by Niantic and to make up for the “Shiny Galarian Ponyta” issue they will are adding additional opportunities to encounter Shiny Galarian Ponyta. They didn’t reveal any details about this “event,” and w expect to see more info very soon.
For the Espeon, Umbreon, and Sylveon issues, they acknowledged that there is a problem on their side and that they are investigating and will be fixing it soon.
As per Niantic: