...and yes, it's legit. You can get one too! There's an event going on now (February 1st to May 1st) over at the Pokemon Global Link. You get it from the Dream World. Oh, and to save you some time, the password for it is ARCEUSVOTE.
On a less thrilling note, there's also a Mamoswine (POKEMONDOTCOM) and a Banette (NPCHARACTER) up for grabs too. Mamoswine's available through February 16th and Banette is available until March 1st.