Gladion is a major character in Pokémon Sun & Moon Versions. Formerly a member of the Aether Foundation, he fled with Type: Null to escape his mother's abusive and unethical behavior. He works as an enforcer for Team Skull, but he is commonly mocked by the grunts, who don't consider him a "true" member. He is the son of Lusamine and brother of Lillie.

Gladion is a human Pokémon trainer. His most notable Pokémon is Type: Null (later Silvally), who he shares a strong bond with.