right here :)
Hit your seed and collect the egg, hatch it and compare its IVs to the frames on the main page of RNG reporter. To can also make this page to show the characteristics of the eggs which make the process a lot easier. After you know what PID you hit when you get the egg you can advance from there.
There's also the Chatot's pitch method; this method requires a good hearing though and takes a lot of practice to master. What you need to do basically, is hear the pitch of Chatot's cry when you look at its summary and compare it to the ones in the main page; but again, this is quite complicated.
To know if you hit your seed--more like timer0 actually-- you collect your egg and fly to a place with high-leveled pokemon, such as Victory Road, catch a Pokemon and compare its IVs to the ones in the main page; that's Gen 5 IVs (standard seed- Wild Pokemon method). If the IVs don't match to those found up to frame 20iirc, then you didn't hit your timer0.
NPCs start moving when the season screen comes up; you don't have control over your character at that time.