TV-Series
Description
Gladio is a significant character in the Pokémon Sun & Moon anime, serving as a rival to the protagonist Ash and the elder brother of Ash's classmate, Lillie. He is a young trainer with a serious and determined demeanor, driven by a personal mission that sets him apart from other characters.

Gladio's background is closely tied to the Aether Foundation, an organization dedicated to Pokémon conservation research, which is led by his mother, Lusamine. He lived there with his younger sister, Lillie. This seemingly idyllic life was shattered by an encounter with an Ultra Beast, a powerful and dangerous Pokémon from another dimension. This event traumatized Lillie, causing her to lose her ability to touch Pokémon, an experience that deeply affected Gladio as well. Driven by a feeling of powerlessness and a desire to protect his sister, Gladio left home approximately half a year before the start of the series to train alone and grow stronger.

His personality is characterized by a cool and focused exterior, born from his singular goal of gaining strength. He is often quiet and reserved, preferring solitude and training to socializing. This dedication makes him a formidable trainer, and he has little patience for those he considers weak or frivolous. However, this cold surface masks a deep sense of responsibility and care for those close to him, especially his family and his Pokémon. His affection for his partner Pokémon, such as his Umbreon, which he raised from an injured Eevee he found as a child, clearly shows his compassionate side.

Gladio's primary motivation is to gain the power necessary to protect Lillie and to confront the threat of the Ultra Beasts, which he holds responsible for the harm done to his family. He harbors a strong resentment towards these creatures and vows to defeat them. This quest leads him to possess a unique and powerful Pokémon named Type: Null, later renamed Silvally. This Pokémon was an artificial creation of the Aether Foundation, designed to be an "Anti-Ultra Beast" weapon, and Gladio fled with it to free it from the restrictive helmet it wore and to harness its power for his own mission.

In the story, Gladio first appears as a rumored powerful trainer in the Alola region, which prompts Ash to seek him out and challenge him to a battle. This marks the beginning of a strong rivalry, though Ash loses their first encounter. As the series progresses, Gladio's hidden connection to Lillie is revealed, and his personal struggle becomes central to the main plot involving the Aether Foundation and the Ultra Beasts. He plays a crucial role in the battle to save his mother, Lusamine, after she is taken over by the Ultra Beast Nihilego. His actions shift from being a lone wolf to reluctantly accepting help from Ash and their friends to rescue her.

Key relationships define his character arc. His bond with his sister Lillie is the emotional core of his story; everything he does is ultimately to protect her, even if it means distancing himself. His relationship with his mother, Lusamine, is complex and strained due to her obsession with Ultra Beasts, though he still cares for her. His rivalry with Ash is one of mutual respect, as Ash's strength, bond with his Pokémon, and determination cause Gladio to gradually open up and reconsider the value of fighting alongside others.

Gladio undergoes significant development, starting as a solitary trainer who insists that his family's problems are his own to solve. Through his interactions with Ash and the others, he learns that accepting help is not a sign of weakness. After the crisis with the Ultra Beasts is resolved, he softens considerably, even smiling when Ash invites him to a wedding. He also resolves to undertake the island challenge to become even stronger, showing his continued growth and willingness to engage more openly with the world around him.

As a trainer, Gladio is exceptionally skilled for his age. His notable abilities include a strategic mind in battle and the possession of a Z-Ring, which allows him to use Z-Moves. His known Z-Crystals include the Rockium Z, Normalium Z, and others. His main Pokémon are his steadfast and loyal Umbreon, his Lycanroc (Midnight Form), known for its power and endurance, and the powerful artificial Pokémon Type: Null, which later evolves into Silvally and can change its type using different memory drives, a key ability in his battles.
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