Emerald RNG is pretty simple, every 1/60th of a second has different nature/IVs. Somehow I've missed this specific 60th of a second every time, but I've hit all around it. Oh well, all this has given me enough time to rack up enough battle points in my cartridge to actually buy the tutor moves once I actually get the Registeel.
Can you do SID checks? I might as well see if my friend has any good shiny frames once I get the Registeel.