Niantic Update 11/15/2022: Trainers, we’re updating the stats and attacks that were erroneously retained by Zorua from Pokémon they impersonated during October 25th’s Shuppet Spotlight Hour. Any Zorua that remained transformed due to issues with a Pokémon GO Plus or Poké Ball Plus will revert to Zorua.
By way of apology, you can now claim an item bundle from the in-game shop at no cost. The restrictions placed on Zorua — including its use in the GO Battle League, trading, and transferring to Pokémon HOME—have also been lifted. Thanks for your patience.
Source: Official Pokémon GO blog