[quote name='WormFOODx']Help me figure out this wonder card nonsense. My daughters couldn't get Arceus on Saturday because it said they had too many wonder cards. I didn't on mine as I was a late bloomer. How do we fix this and does it remove the pokemon they got from the wonder cards?[/QUOTE]
Go to the Mystery Gift option on the main menu, and then "Check Card". From there, you can select one, then click "Trash". I think your only allowed 3 Wonder Cards at a time. As long as you've already received the Pokemon from the Delivery Man, it's ok to delete the card.