It seems to me that you're trying to use a hacked meloetta, an get it through Pokebank.
While I don't agree with the ethics of this, there are some flaws.
Like Erapidash said Met in Sinnoh. Really? It doesn't take a genius to realise something went fishy there. 'Apparently had a fateful encounter at Lv. 50' is the English B2W2 description of it.
Anyway if indeed you're trying to push a hacked Pokemon through Pokebank try making it as accuracte as possible in comparison to the actual details of the Event Meloetta. Chances are it won't go through, but the closer it is to the actual thing, the more likely it becomes it will. Sometimes you may not be able to transfer it through, no matter what you do.
If this isn't hacked, and the Sinnoh thing was just a typo you should have nothing to worry about. It'll go through.