you can't make him move the boxes; you have to wait a while (about a day or so) and then come back and see whats been moved.
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There is no cheat in Pokemon to get additional PC boxes. Those who need additional space in Pokemon X and Y can use Nintendo's Pokemon Bank service.
no way
GO to a PC save Deposit The Pokemon YOU want to clone Then Change boxes when it says saving... don't turn off the power turn it off anyway, If its done right then you ll have the original one in your party and the copied one in the box!
I'm Sorry but you cant get more than 18 boxes in Pearl/Diamond
you can't catch more pokemon. you have to get rid of some pokemon.