Lati@s in BW2 are stationary. Just save a step before you encounter them. Also, make sure you battle the little boy in the doubles grass so he doesn't move around before you go to RNG it.
Always in the same place.
Keypresses don't have any effect on the Timer0.
Keypresses have nothing to do with the Timer0, the hints at the first page are slightly outdated. The only thing you can do is using an external timer with milisecond display and praying. Use the Timer0 you get more often.
With "seed" you mean "actual seconds"? In that case you have to make sure the difference between it and your pressing seconds are constant. Using an external timer with milisecond display like EonTimer helps in that regard, especially when you are using DSi onwards.
Are there any wnpcs to mess me around on marvellous bridge?
I'm really not sure Why I'm not hitting my seed, It tells me I am hitting my time, and the Timer0 seems to not have changed. Perhaps someone can find something I missed in these? The first seed of the first screenshot is the one I was trying to use. It tells me, when using the DS PARAMETERS and plugging in ivs, that I hit my time, but the ivs are not the same as the seed.
http://s936.photobucket.com/user/MrMeowser/media/Screenshot_1.png.html
http://s936.photobucket.com/user/MrMeowser/media/Screenshot_2.png.html?sort=3&o=0
If the IVs don't match then your not hitting your seed. Try callibrating somewhere like the last cave before the elite 4 where there's no ndering NPCs. Also for a DS lite you should have a 1 sec offset.