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Pokemon Legends Arceus lets players experience the Sinnoh region long before Diamond and Pearl, and sequels should visit all the other regions.
Source: https://gamerant.com/pokemon-legends-arceus-spinoff-series-visit-every-region/
The other thing to point out is that the Hisuian Samurott is obtainable in Pokemon Legends: Arceus, it's just the original version of the Pokemon that can't be caught in any of the Switch games.
Source: https://gamerant.com/pokemon-you-cant-get-on-switch-list/