Im not sure if you ment 'wonder cards' or 'wonder guards', but a wonder guard is when Pokemon can only get hit with super efffective moves such as sheer cold.
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look at the wonder cards in the mystery gift menu. select the card and go on "delete"
you have to to obtain the Pokemon and delete the wonder card
get pokesav from pokesav.org and make a cheat for pokemon you want in pokemon diamond. ----
You are able to get them online to obtain Darkrai.
yes, you will. Belive me i tried it!