[1] Start the game at the DS date\time that gives you the desired initial seed.
[2] Select "New Game".
[3] Begin the process of starting a new game, up to the point you can open the menu. (Obviously, do not save at any point.)
[4] When Professor Araragi asks you a Yes\No question right after you input your nickname, choose YES. (Choosing NO even once at this point means you will have to start again from step 1.)
[5] Look at your new Trainer Card and record the trainer ID.
[6] Repeat steps 1-5, but when Araragi asks you Yes\No after the nickname, say NO once to go back to the nickname screen, then say YES. Record the trainer ID that results.
[7] Repeat step 6, but this time say NO twice before saying YES. Record the trainer ID that results.
[8] Repeat step 7, but this time say NO three times before saying YES. Record the trainer ID that results.
[9] Enter the four IDs into this program, in the order you obtained them.
[10] Look at the list of natures that results and compare them with Pokemon you caught.