I don't know if you ever got an answer for this but you can make a Living Dex out of a Scarlet save by changing the option for allowing incompatible. They'll have the right information but they won't have the right picture. If you try to edit and set them in that save they'll change to a ScVi compatible Pokemon, so I'm just using it as a record while keeping a Regional and National Dex for each game. You go to Options > Settings > Advanced and change AllowIncompatibleConversion to "AllowIncompatibleAll".
