Chunwa

I've been trying to make the shared box work. I enter save 2, put my randomized starter and full iv ditto in the shared box, then I start save 3 and enter passwords, no full ivs this time. I get my starter normally, don't use the randomizer feature and just walk up to the pc, but now my shared box is empty and if i go back to save 2, it stays empty. What exactly am I doing wrong here? can someone help me figure out what the problem is?