The games were announced worldwide on the 25th Anniversary of the release of Pokémon Red and Green on February 27, 2021 at 12 am JST through Pokémon Presents. The paired versions were released worldwide for Nintendo Switch on November 19, 2021. All copies of the game are playable in nine languages: Japanese, English, German, Spanish, French, Italian, Korean, and Simplified and Traditional Chinese. These are the first core series games not to be developed directly by Game Freak.
Overall, the game's graphical style is different compared to Pokémon Sword and Shield. The camera returns to a mostly top-down viewing angle similar to the original Diamond and Pearl, while the player and NPCs appear with chibi proportions in the overworld but regular proportions in battle. The regular overworld uses random encounters only, while Pokémon Hideaways in the Grand Underground use symbol encounters.
Like in the originals, the games only include Pokémon from the first four generations; therefore, the games include a total of 493 Pokémon.