I received a shiny Pokémon through the Surprise Trade, which I presumed as hacked due to the name of the trainer and Pokémon. I've received quite a few of these in the past, so I will take the held item and then store them in my never-to-be-used box.
The Pokémon I received this time had new icon that I had never seen before. I checked all my previous Pokémon, and none of them have it. To my knowledge, I have never seen this icon until the release of Crowned Tundra.