Pokémon Ultimate Journeys: The Series is the twenty-fifth season of the Pokémon anime series and the third and final season of Pokémon Journeys: The Series, known in Japan as Pocket Monsters (ポケットモンスター, Poketto Monsutā). The season premiered in Japan on TV Tokyo from December 17, 2021 to March 24, 2023, and in the United States Netflix released new episodes on October 21, 2022, February 24, 2023 and June 23, 2023, and the final part titled Pokémon: To Be a Pokémon Master, known in Japan as Pocket Monsters: Aim to Be a Pokémon Master (Japanese: ポケットモンスター めざせポケモンマスター, Pocket Monsters Mezase Pokémon Master), on September 8, 2023. In Canada, the season aired from May 28, 2022 to July 29, 2023.

The season culminates the research fellowship adventures of Ash Ketchum and Goh, as they travel across all eight regions, including the new Galar region from Pokémon Sword and Shield and the Galar region's Crown Tundra from Pokémon Sword and Shield: The Crown Tundra. Ash ascends through the ranks of the World Coronation Series to enter the Master Class and Goh continues his work with Project Mew to be a Chaser and find Mew. In the final part titled Pokémon: To Be a Pokémon Master, Ash travels with his old friends Misty and Brock.

Pokémon: The Arceus Chronicles is a set of four special episodes based on the Pokémon Legends: Arceus game, released on January 21 and 28, 2022, in Japan on Amazon Prime Video. These episodes debuted on Netflix on September 23, 2022.

This marked the final season to feature Ash and Pikachu as the main characters, as well as the Team Rocket trio. Starting with the next season, Pokémon Horizons: The Series, which premiered in Japan in April 2023, two new main characters were introduced, Liko and Roy.

The Japanese opening songs are "One, Two, Three" １(ワン)・２(ツー)・３(スリー), Wan, Tsū, Surī) by Karaage Sisters for 9 episodes, and by Satoshi / Ash Ketchum (Rika Matsumoto) and Goh (Daiki Yamashita) for 37 episodes, and "Aim to Be a Pokémon Master -with my friends-" (めざせポケモンマスター -with my friends-, Mezase Pokémon Masutā -with my friends-) by Rika Matsumoto for 11 episodes. The ending songs are "Supereffective Type" (バツグンタイプ, Batsugun Taipu) by the Pokémon Music Club for 65 episodes, "One Hundred Fifty-One" (ひゃくごじゅういち, Hyakugojūichi) by Unshō Ishizuka for 6 episodes, "Takeshi's Paradise" (タケシのパラダイス, Takeshi no Paradaisu) by Yūji Ueda for 1 episode, "Riding on Lapras" (ラプラスにのって, Rapurasu ni Notte) by Mayumi Iizuka and Rikako Aikawa for 1 episode, "Face Forward Team Rocket!" (前向きロケット団！, Maemuki Roketto-dan) by Team Rocket (Jessie, James, Meowth and Wobbuffet) for 1 episode, "Type: Wild" (タイプ：ワイルド, Taipu: Wairudo) by Rika Matsumoto for 1 episode, in which the latter ending themes are taken from past seasons of the anime, and the English opening songs are "With You" by Echosmith, and "Gotta Catch ém All" by Ben Dixon and the Sad Truth with Haven Paschall and Hilary Thomas. These instrumental versions were served as ending themes.

The series received the Anime Series of the Year award at the 4th VP Choice Awards, held in Pasig, Philippines, on March 29, 2023.