| Season Number: | 25 |
| Bgcolour: | brown |
| Network: | TV Tokyo |
| Prev Season: | Master Journeys |
| Next Season: | Horizons |
| Episode List: | List of Pokémon episodes (seasons 14–present) |
Pokémon Ultimate Journeys: The Series is the twenty-fifth season of the Pokémon animated 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 Alola Champion 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 , based at Cerise Laboratory in Vermillion City in the Kanto region. 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. Four episodes released on January 21 and 28, 2022 (exclusive to Amazon Prime Video in Japan) are an arc based on the Pokémon Legends: Arceus game, with the third and fourth episodes coinciding with the release of the games. The story arc debuted on Netflix on September 23, 2022, under the name Pokémon: The Arceus Chronicles.
This marked the final season to feature Ash and Pikachu as the main characters. Starting with the next season, , which premiered in Japan in April 2023, new protagonists and main characters were introduced.
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The Japanese opening songs are "One, Two, Three" ・・, Wan, Tsū, Surī) by Karaage Sisters for 9 episodes, and by Rika Matsumoto and 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 serves 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.