>>27103912Maybe or maybe not. When I hacked Diamond and Platinum I remember either one or both of the codes not always working.
It might not work from the Mystery Zone because you start the game on ground you're not supposed to interact with, so the game can't transfer the properties of the normal ground to the non-existent ground as it would be able to if you started on normal ground. That is *if* the code works by storing the properties of the ground you were originally moving on.