A young woman from a small community on the outskirts of Domorto far in the post-apocalyptic future, Priscilla was raised from birth to be able to read. Intended to inherit her mother's position as the community's Segretoscere (lit. 'knower of secrets' - a highly respected position in her community typically held by women who learn to read and use or repair salvaged technology), Priscilla took to the learning like a fish to water. Unfortunately, however, an attack on her community's camp from a neighboring community forced her to flee, along with her only true friend - a young Mawile she had taken to calling Alonne, after a story she had read - into Time's Scar, a place she knew her attackers would not dare enter.
A runt of a Mawile Priscilla encountered when she was asked to join on a salvaging expedition, Alonne saved Priscilla when she was attacked by a wild Sandslash after she had gotten separated from her group. While Alonne was unable to defeat the attacker, it was able to hold it off long enough for Priscilla to flee - only to return to collect the fainted Pokémon. Priscilla nursed her back to health, and the two have been inseparable since, Alonne serving as her stern, unflinching protector.