My legit event Mew from my Japanese Emerald version didn't pass the Pokebank; however, that was the only one that gave me trouble.
It figures, Gamefreak did another crappy job with this. They should've just allowed for all hacked pokemon since some legit pokemon can't be transferred now. Not to mention loads of clearly hacked pokemon made it through already.
One of the people I've traded with has Eevees in Safari, Love and Moon Balls, all of which are technically illegal because Eevee is never in the Safari Zone, nor anywhere in Heart Gold or Soul Silver to catch in the Wild. I will say they are tempting to trade for, but don't know if I will since the whole illegality thing..

