"Pokémon Horizons: The Series" introduces a fresh narrative set in the Pokémon world, centering on a new protagonist, Liko, and her partner Pokémon, Sprigatito. Liko, a young girl from the Paldea region, embarks on a journey after receiving a mysterious pendant from her grandmother. This pendant holds significance tied to ancient Pokémon lore and attracts the attention of the Explorers, a shadowy organization seeking its power. Alongside Liko is Roy, a passionate Pokémon Trainer from Kanto, and his partner Fuecoco. Together, they join the Rising Volt Tacklers, a group of adventurers led by Friede, a skilled Trainer with a Charizard named Captain Pikachu.

The series explores themes of discovery, friendship, and the pursuit of knowledge as Liko and Roy travel across regions, uncovering secrets about the pendant and its connection to the legendary Pokémon Terapagos. The Explorers, led by the enigmatic Amethio, serve as persistent antagonists, driven by their own motives to harness the pendant's power. The narrative balances episodic adventures with an overarching plot, as the protagonists encounter new Pokémon, face challenges, and deepen their bonds with their partners.

Key characters include Dot, a tech-savvy member of the Rising Volt Tacklers, and her Quaxly, who provides comic relief and support. The series also introduces a diverse cast of Pokémon, both familiar and new, reflecting the expansive world of the franchise. As Liko and Roy grow as Trainers, they learn about trust, resilience, and the importance of understanding Pokémon. The story builds toward a climactic confrontation with the Explorers, intertwining personal growth with high-stakes action and exploration of the Pokémon world's mysteries.