Left Poké Ball

A Poké Ball with a Pokémon that lost its Trainer inside.

Game descriptions

Ultra Sun, Ultra Moon:A Poké Ball with a Pokémon that lost its Trainer inside. It seems to be from Ula’ula Island.
Sword, Shield, B.Diamond, S.Pearl:A Poké Ball with a Pokémon that lost its Trainer inside. It seems to be from Ula’ula Island.
Scarlet, Violet:A Poké Ball containing a Pokémon that lost its Trainer. It seems the Trainer hails from Ula’ula Island.