Lautitia, originally named Volo in her world of Hisui, worked for Arceus’s attention, but Arceus chose Akari instead, and Akari got the Azure Flute instead of him. In Volo’s eyes, Akari did not deserve that right, not the attention from Arceus. After learning the secret of time travel by using the Green Stone, which supposedly harnesses Celebi’s power, Volo, now under the fake name Lautitia, used it to figure out where Akari’s real world reincarnation, Grace, lived, and travelled to that world.