there is a site with some useful wonder mail S codes:http://www.neoseeker.com/forums/41993/t1438098-wonder-mail-passwords/2.htm#23
there is also this one:http://www.gamespot.com/ds/rpg/pokemonfushiginodungeonsoranotankentai/show_msgs.php?topic_id=m-1-51705244&pid=955859&page=9
tll now those are the only ones that I found
Hope that helps^^