http://www.smogon.com/forums/showthread.php?t=64925
On the RNG Reporter, click DPPt Time Finder and Shiny Egg. This feature searches for low tap shiny eggs.
Search Minimum and Maximum Delays 594-606 (which is my Platinum's delay, so it may vary for you...).
Delay is simply how long it takes you to power on your DS, go through the pretty title screen, and hit Continue. :>