Mairin is a new Trainer just starting her journey in the Kalos region. She refers to her partner Harimaron as "Hari-san", who she just got recently from
Professor Sycamore and she always asks it for help.
While traveling in the forest she watched the Mega Evolution battle between
Astrid and
Alain and was shocked when she saw his black Lizardon. She was fascinated with it and wanted to learn more despite
Alain not being very forthcoming with his answers.
She was very impressed and amazed with the story that
Professor Sycamore told about
Ash Ketchum and how
Professor Sycamore's Garchomp at the laboratory went on a rampage.
Having watched
Alain battle Mega Evolved Pokémon,
Mairin decided that she wanted to search for Mega Stones with
Alain and he carelessly agreed to let her travel with him.