To make the pokemon in storage slots, in Pokesav main window, you'll see down right there is "Storage" and an Edit option. Click Edit and start making your pokemon from there. Pay attention to the box number, if you made your pokemon in Box 1 number 1-3, then in exporting ARDS you should choose "Pokemon Storage Codes". Choose the box and number where you made your pokemon before (e.g. Box 1, Pokemon 1-3), then it would replaced your first three pokemon in Box 1 in PC.