I already have 12 of them. You can just change the date, put the 3DS in the sleep mode and you will get another batch of entries.
Did you go back to Pokédex 3D? It should show on the top right corner of the touch screen that there is a new Pokémon (keep in mind that this can only be done three times a day).Is there a specific time this Pokemon download happens? Because my Wi-Fi works in my house, I have Spot Pass on for my actual 3DS and Pokedex 3D, I've closed my 3DS when it's in the home menu for hours now, and I haven't gotten anything. Am I just really unlucky or am I doing something wrong?