I though you were gonna say that lol :P. I just figured out that there are 2 spreads with the same IVs -____-. One is ability 0(the one you used which gives you a female one) and the other is 1
(my spread (PID: 628a6a85 (BOLD, ability 1) 30/6/31/30/31/31 (Seed: 720f0284 Frame: 2392) HP GRASS 70) that's shiny in my game and male).
I think I might wait until I get a Action Replay Max before I attempt it so that I can back up the save file and RNG it on Desmume so that I can use save states :P.