Pokemon Scarlet and Violet is the first Generation 9 game in the series and takes place in the Iberian Peninsula-inspired region of Paldea. The big theme of the games is the conflict between Past and Future, represented in details such as the designs for the criminally hot Professors Sada and Turo (each of them exclusive for Scarlet and Violet respectively), the new Legendaries Koraidon and Miraidon and the introduction of the new Paradox Pokemon.
These should not be confused with new evolutions or forms, as they are entirely new species of Pokémon and should be treated as such. At the same time, they’re also different from Wigglet, which is not Digglet but another Pokemon with a similar background and resembles it by pure coincidence and adaptation to the environment.