Volo's egg
Music - A Crow's Trial (Vane)
From my Punished!Volo AU.
In summary, he gets sent to the future by Arceus after talking with Laventon about what happened with Giratina, and he has amnesia. And is sent to Unova purposelly to meet with Emmet.
Emmet gave him an Egg that Elesa gave him, it was lost with the mother nowhere to be seen.