20 only in Scarlet and 20 only in Violet. To complete your Pokédex, trade with a player who has the other edition — each row names the exclusive from your own edition to offer in return.
The DLC maps (Kitakami, Blueberry Academy) have version exclusives too; they are not marked here yet.
Playing Violet? Trade for these with a Scarlet player.
Playing Scarlet? Trade for these with a Violet player.