Ok I read that wrongly haha, yes you are allowed to do so soulsilver. Look at it this way, sure the chance is 1/2046 in gen IV. But the breeding process just takes so much longer that it is at least worth the amount of time/trouble you get yourself into to get a shiny. (Oh and you never replied on my VM though haha :D)
PS: 7700 RE for nidoran and nothing pff, sad days xD.
Welcome Kirozane, hope you will enjoy the challenge as much as we do :D!