Regarding your reply in my thread - yes it's from a legit wondercard. The only proof I can offer is that I just recently got an AR a few days ago and if you really wanted to you could see all my VM conversations regarding cloning my Pokemon at the time of the event. I wouldn't need people to clone my Pokes if I had an AR. I had the Celebi when the event came out but didn't have an AR :)
In addition I believe shady6121 was the one to clone this particular Celebi. I'm pretty sure I also posted about it in the "Discuss my Pokemon" thread and got some VMs about it.