Pokémon: Battle Frontier is the ninth season of Pokémon and the fourth and final season of Pokémon the Series: Ruby and Sapphire, known in Japan as Pocket Monsters: Advanced Generation (ポケットモンスター アドバンスジェネレーション, Poketto Monsutā Adobansu Jenerēshon).

Along the way, they are joined by Brock, the former leader of the Pewter City Gym (and old friend), as well as the ten-year-old Pokémon Coordinator May and her younger brother Max, as May collects Ribbons from Pokémon Contests so she can compete in the Kanto Grand Festival.

The episodes were directed by Masamitsu Hidaka and Norihiko Sudo, and were produced by the animation studio OLM.

Viz Media have released the series in the United States on two three-disc volume sets.

[2] Viz Media and Warner Home Video later released the complete series on a 6-disc DVD boxset on January 8, 2019.