(a prequel version of Sinnoh). The story is unique for the series as it features an "isekai" beginning where the protagonist is sent back in time by the mythical Pokémon Story Overview The Arrival:

—protectors of the land who have been driven into a frenzy by a mysterious lightning from the space-time rift. Pokémon Legends: Arceus Key Game Details

To understand what you are looking at, you first have to decode the technical jargon often found in file names on the internet.

¿Quieres un post para redes (Twitter/X, Instagram, Facebook) promocionando "Leyendas Pokémon: Arceus -NSP- -Juego base- -Ver..."? Indica la plataforma y el tono (informativo, entusiasta, humor, venta) o confirmo un formato general; si no respondes, crearé un post breve para Instagram con tono entusiasta.