James Bondage
/b/
It doesn't work with the Day-Care man (the IVs will change, but not nature, gender and shininess), but it does work perfectly with NPCs, such as Riley.
Actually, you can SR for nature with the Day Care Man.
What you have to do is...
1) Save in front of the day care man when he is offeing you an egg.
2) Pick up an egg from the day care man after the save has completed.
3) Wait for the day care man to be ready to offer you another egg.
4) Save the game.
5) Hatch the original egg.
6) Check it's nature, if it is not correct, get the new egg gfrom the day care man.
7) Hatch it.
8) Check the nature. If it is not corret, soft rest the game.
This works because though an eggs nature is decided at the day care when the egg is produced, if you have an unhatced egg in your party when the new egg is roduced, the new egg will not have it's nature set until it is either actually recieved, or the first egg was hatched.
This is a pain in the butt to do, and hardly worth a players time, but it does work. This info actually can be found on both Smogon, and Bulbapedia.