|First Appearance:||Pokémon: Mega Evolution Special I|
|Voice actor:|| Mikako Komatsu (Japanese)|
Zoe Martin (English)
Mairin is a character who appears in the X and Y Mega Evolution Special. She made her debut in Mega Evolution I.
Mairin is a Pokémon trainer and companion of Alain. She begins her journey after receiving her Chespin, and soon discovers the Pokemon Trainer Alain while observing his battle against a Mega Absol. Intrigued by Alain's ability to Mega Evolve his Charizard, she decides to join him on his journey to battle every known Mega Evolved Pokémon. Despite Alain's requests to be left alone, Mairin stubbornly continues to follow him, insisting that he is the best way for her to learn about Mega Evolution.
Despite their rocky relationship in the beginning, Alain and Mairin soon grow to trust and respect each other. When they meet the Hoenn Champion Steven and encounter Rayquaza for the first time, Alain is injured while protecting Mairin from a Draco Meteor. Mairin begins to fear Rayquaza and the risks Alain is taking to recover the Giant Stone. She begs him not to confront Kyogre and Groudon, but he refuses, and attempts to abandon her in Hoenn to keep her safe. Despite her fear of the Legendary Pokémon, Mairin manages to sneak on board Steven's airplane and follow Alain.
When Alain is later knocked unconscious as he and his Charizard struggle to imobilize the two Legendary Pokémon, Mairin leaps from the plane and rushes to his side, dragging him to safety with the help of Steven's Metagross. He regains consciousness just as Rayquaza manages to break up the fight between Kyogre and Groudon. He is surprised to find Mairin had followed him, but their reuinion is cut short when Lysandre's team arrives and captures the Giant Stone, forcing Mega Rayquaza back into its natural form.
Mairin and Alain return to the Devon Corperation, where Alain then abandons Mairin once again, fearing for her safety if she were to remain with him. Mairin learns from Steven that Alain has returned to Kalos, and she stubbornly decides to follow him. Steven joins her and flies to Kalos with her, where Alain continues his efforts to become stronger.
As a novice trainer, Mairin is often seen as curious, energetic, and an extreme klutz, to the point where it can be considered comedic. Mairin exhibits great care in her Pokémon, and at times boasts of her ambitions which she is teased for. Despite all this, she quickly warms up to kind people, which may have been a considering factor as to why she followed Alain. In certain situations, she is obedient and is greatly concerned when her friends are harmed, worried for their overall well being.