Niantic recently unveiled a brand-new loading screen for Pokémon GO to coincide with the start of September 1, 2021, also known as the Season of Mischief. The new loading screen, which you can check out in the image above, features the Mythical Pokémon Hoopa, Pikachu, Chimchar, Turtwig, Piplup, Dedenne, Furfrou and Phantump near a Pokémon GO Trainer out to explore. In addition to the new loading screen, Niantic has also updated its social media header with a new image that features Piplup, Turtwig, Chimchar, Teddiursa, Hoopa, Golett and more iconic Pokémon.
Source: Official Pokémon GO Twitter