TV Special
Description
Mairin, a beginner Pokémon Trainer from Kalos introduced in the Mega Evolution Specials, sports spiky maroon hair and light brown eyes. Her attire features a yellow long-sleeved shirt, light green cloak, dark green pants with light green accents, brown suspenders, and brown shoes, accessorized with an orange-yellow scarf, a wrist bracelet, and a green hat bearing a yellow pompom.

She received Chespin from Professor Sycamore, nicknaming it Chespie. Witnessing Alain battle a Mega Absol sparked her obsession with Mega Evolution, compelling her to persistently shadow him despite his initial resistance. Alain’s tactical guidance later helped her capture a Flabébé using Chespie’s Toxic; she named it Bébé and healed it at a Pokémon Center.

Accompanying Alain to Hoenn, Mairin encountered Steven Stone and Lysandre, observing conflicts involving Mega Rayquaza and primal reversions of Groudon and Kyogre. She repeatedly defied Alain’s safety warnings, sneaking onto Steven’s plane to witness his battles. When Alain shielded her from Draco Meteor and collapsed, she dragged him to safety with Steven’s aid.

Back in Kalos, Alain dismissed her as a hindrance at Lysandre Labs. During her solitude, Chespie rescued a Zygarde Core during an experiment malfunction, absorbing energy that left it comatose. Mairin begged Lysandre for help, prompting Alain to undertake missions seeking a cure.

While Chespie remained comatose, Mairin stayed at Lysandre Labs, sending Alain encouraging video messages. Visiting Lumiose City for the Kalos League, she bought a Jirachi accessory for Chespie and helped return Clemont’s lost Chespin, momentarily revealing her grief before masking it. She watched Alain battle Ash in the finals from Lysandre’s viewing box.

After Lysandre initiated his apocalyptic scheme, Mairin recognized his betrayal and was saved from a Team Flare grunt by Professor Sycamore. With Serena, Sycamore, and Team Rocket, she infiltrated Lysandre Labs to retrieve Chespie, only to see it absorbed by the Giant Rock. Ash and Alain later freed Chespie—now Zygarde 50% Forme—ending its coma. Alain apologized for his past behavior; Mairin forgave him, emphasizing his safety. She subsequently hosted his welcome party at Sycamore’s lab.