Hm I'm not sure if that Mew is legit. There's no record of such event and New York pokemon center always adds a small letter a,b,c or d depending from which machine the pokemon was downloaded. The ID is suspicious as well. I've done some research and no one seems to know the origin of this Mew. I cannot proof that it's hacked, but neither can I find any evidence that there ever was such event (All events are documented somewhere (not all are listed on Bulbapedia, however) - including very rare ones - since Nintendo officially announces an event). I'm personally leaning towards fake (no record, the OT doesn't match the NYPC OT and ID looks suspicious) and therefor have to pass on it.
As for your other events, could you please tell me the date and nature of the following pokemon
- Pacifico minato pikachu lax
- Cosmo world minato pikachu
- Jessie’s wobbuffet 2014 europe
- Pokeball vivillon (also, is this the French or Japanese one?)
- Diancie 2014 movie (also, is this the Taiwanese or Japanese one?)