On August 5th, 2017, around 01:37 GMT, a Marshadow test card was uploaded for testing, and quickly removed.
As per previous tests, it was likely to test if the the Serial Codes they have on hand can retrieve the card from the correct Wonder Card ID slot.
(Meaning, they're likely reserving this wonder card ID for international releases of Marshadow)
The data is identical to the upcoming Red Hot Charizard (it's used as a base, for the dummy test)
Internal Name: 0626_Marshadow_Serial_Test-Mo-1501897008