Mable is a recurring antagonist in the Pokémon XY & Z anime, serving as one of the five scientists of Team Flare in the Kalos region. Her Japanese name is Momiji. She is a tall woman with distinct blue hair, blue lipstick, and a prominent visor covering most of her face, which gives her a cold and scientific appearance. As a member of Team Flare, Mable is deeply committed to the organization's goal of using advanced technology and Pokémon energy to create a new, purified world under the leadership of Lysandre.

Her background is rooted in scientific research, particularly in the field of Pokémon energy manipulation and Mega Evolution. In the anime, she appears during the Team Flare story arc, where she assists in the group's operations by modifying stolen Poké Balls and conducting experiments on powerful Pokémon. She collaborates closely with her fellow scientists—Aliana, Celosia, Bryony, and Xerosic—focusing on teamwork and strategic planning to advance Team Flare's objectives. Her personality is characterized by a cold, professional demeanor and a single-minded focus on her work. She rarely shows emotion beyond irritation when her plans are thwarted, and she speaks in a blunt, matter-of-fact manner that underscores her detached scientific worldview.

Mable’s primary motivation is to contribute to Lysandre’s vision of a beautiful, uncorrupted world. She believes that her research and actions are necessary to achieve that goal, and she shows little concern for the harm caused to Pokémon or people in the process. This makes her a loyal and effective agent of Team Flare, but also a morally cold figure who values results over ethics.

In the story, Mable plays the role of a supporting antagonist. She is first encountered in Frost Cavern, where she is agitating an Abomasnow in an attempt to provoke a reaction from its Mega Evolution energy. When the protagonist intervenes, she engages in a Pokémon battle but is defeated, forcing her to retreat. Later, she appears again in Lysandre Labs, where she guards a key needed to access Lysandre’s command center. She battles the protagonist once more alongside her Houndoom and Weavile, demonstrating her reliance on Dark-type Pokémon. Her role is to act as an obstacle that highlights the scale of Team Flare’s scientific network and the challenges the heroes must overcome.

Key relationships include her fellow Team Flare scientists, with whom she shares a professional bond, and Lysandre, whom she serves without question. She also comes into direct conflict with the anime’s main characters, particularly Ash Ketchum and his friends, as they work to stop Team Flare’s plans. There is no significant personal development or redemption for Mable within the XY & Z anime; she remains a loyal scientist to the end, and her fate is tied to the organization’s downfall.

Notable abilities include her expertise in Pokémon energy research and her use of technology to modify Poké Balls for Team Flare’s purposes. In battle, she fields Houndoom and Weavile, both Dark-type Pokémon that reflect her pragmatic and somewhat ruthless approach. She is a competent trainer but not among the strongest, as she is defeated relatively easily by the protagonist. Her strength lies more in her scientific contributions than in direct combat.

Overall, Mable is a minor but memorable antagonist in the Pokémon XY & Z anime, embodying the cold, utilitarian side of Team Flare’s scientific corps.