http://www.pokecheck.org/?p=detail&uid=2903816
False positive(Negative maybe?). A RNG'd egg from W1 and then traded to W2 says is from a Wonder Card (WC #29: A Secret Egg!)
Edit:
5 new borns. Breed on W1 and then hatched on W2, all saying are from the WC #29: A Secret Egg!
https://www.pokecheck.org/?p=detail&uid=3021889
https://www.pokecheck.org/?p=detail&uid=3021890
https://www.pokecheck.org/?p=detail&uid=3021892
https://www.pokecheck.org/?p=detail&uid=3021894
https://www.pokecheck.org/?p=detail&uid=3021895