Catch Pokémon That Resemble Poké Balls! Get ready to celebrate Pokémon Day by catching Pokémon that resemble Poké Balls! From Friday, February 23, 2024, at 00:00 UTC to Tuesday, February 27, 2024, at 23:59 UTC, mass outbreaks of Voltorb and Foongus will be appearing throughout the Paldea region.
Shiny Voltorb and Shiny Foongus are more likely to appear in these special mass outbreaks, and lucky Trainers might even encounter a mystery Pokémon. This mystery Pokémon—which also resembles a Poké Ball—cannot normally be encountered in Paldea, so stay on the ball as you search for one!
Event Schedule Friday, February 23, 2024, at 00:00 UTC to Tuesday, February 27, 2024, at 23:59 UTC
Featured Pokémon Voltorb, Foongus, and ???
Location Paldea
The visible bits of the mystery pokemon look like Hisuian Voltorb to me.
Game8 is stating it will be a Hisuian Voltorb.