Pokeradar is extremely hard to get wild Pokemon from. You have to luck it out so a shaking patch of grass is in the right spot. I'd just get one from the trophy garden in Platinum if I were you.
Yes, those are slot numbers. To check what slot you'll encounter for your frame (Method J), use the newest version of RNG reporter and just right-click on a Method J frame and click "Check Encounter Slots." It should give you all the information you need.
I don's see the option to "check encounter slots." I found the seed and put it on the main RNG page. I then found my frame and when I right click it I don't have the option to check encounter slots.
I have the 6.00 version of RNG.
Nevermind, needed to download newer version.