So I'm trying to create perfect Dittos with 31 straight IVs of every nature. I did this because I wanted to have perfect Dittos to hold destiny knots in which they would pass IVs easily. I gave it a whirl on pokegen but the game rejects it when trying to pokecheck. I did not fill out PIDs on each of them but I left nothing out of the ordinary except I have the dittos in a luxury ball (I hear there is pokeball inheritance in Gen 6) and having met them at level 45 at giant chasm (2) in Black 2 tall grass.

What the fuck am I doing wrong. Even the one where the system could find a perfect PID was rejected.