Ah, okay. Right, you need to select the HGSS option, and you get three checkboxes for each roamer. Check the E(ntei) and R(aikou) boxes, then enter the routes each of them are on into each text field beside their respective boxes. In the "year" box, put 2010, and in the second box, but 59.
Then click generate, and a list of times should appear. Pick one, and select it. Then, in the row in the middle, set Delays to +99 and -99, and Seconds to +1 and -1. For now, leave the "Odd/Even match seed's delay" checkbox unchecked. Then click the second generate button.
Now, open up PikaTimer, and enter your most common or average calibrated delay in the "calibrated delay" box, then whatever the delay for your seed is in the "wanted delay" box. Then enter your calibrated second in the "calibrated second" box, and 59 in the "wanted second" box. Then click create timer.
You should now be ready to start trying to hit your seed. I'll explain that once you've done all of this.