I understand, I'm fine with a hacked meloetta.
You don't understand.
You CANNOT send a Shiny Meloetta to the Pokebank because Nintendo ensured that Shiny locked pokemon that are forcefully turned Shiny are not allowed to be transported to the bank, This is to lower the rates of hackers who think "durr, unobtainable shinies are osm, I will hax them and spread them over the community."
This is why you never really see people with Shinies like Victini, Jirachi, Celebi, Arceus, Reshiram & Zekrom, Keldeo and a few others.
They have been coded to never be obtained as Shinies legally, Nintendo ensured that hackers are "punished" for doing this in previous regions.
Full list is here.
http://bulbapedia.bulbagarden.net/wiki/Shiny_Pokémon#Unobtainable_Shiny_Pok.C3.A9mon
You can get your perfect statted Meloetta from someone who uses Pokegen, But it will be a Non-shiny version, Unless you consider buying a Powersave device to be able to forcefully make it a Shiny.
Even though you have seen another user with a Shiny Meloetta on X/Y, They have used a Powersave and due to Nintendo still sticking to that rule, It will always be Untradable via Wi-Fi related services (unless they do a Shiny Meloetta event on X/Y)
If you have a friend in real life who uses a Powersave, You could send them your Non-Shiny Meloetta and they would be able to trade you via local trading.
I hope I've helped.
I'm pretty sure you could have a one in a million chance to get a shiny one through the distribution.
I may be wrong.
Meloetta is Shiny locked and I'm pretty sure it's 1/8,192 for Black/White anyways.