yes it worked fine on my black UK version....the code was picked up from a page at the beginnin of this thread here.....well....maybe you use a white retail copy and need to look for that code here!
@ArtemiSerebii: unfortunately i did not try that code on my own, because i got the Liberty Pass from WiFi event...........but for all that have a problem....here i made a Wonder Card with Pokesav to let the Liberty Pass be legal: