maybe if you rephrased your question
'cuz I didn't get what you were talking about 'til first guy replied
there probably is a gameshark code to do it, by why don't you just trade for
it or better yet, use a gameshark code to catch it in the wild.
here's the codes for gameshark SP that will make them appear
83007d22-0xxx
115 is treecko
118 is torchic
121 is mudkip
um...look in the codes & cheats section
someone listed all 386 pokemon codes there
u'll need the master codes listed there too
they're like on the 10th pages
0000 b138 000a
something like that
there's a second line but I don't remember it
anyway...there you are