[Even just providing a sounding board is wonderful, and Ford won't turn his nose up at it. As far as he's concerned this is an interesting discussion, but then again, he loves talking about his own pet projects.]

If I were to guess I would posit that the movement is meant to mimic something in nature, though what I couldn't tell you. As far as I know wild Pokémon don't carry their eggs with them in the same way, or someone would have observed it by now.