Just gonna drop this right here lol xD
This is from Pokemon Global News:
Pokémon Bank Notes
If you transfer a Pokémon to Pokémon Bank and then on to Pokémon Sun or Pokémon Moon from Pokémon Omega Ruby, Pokémon Alpha Sapphire, Pokémon X, or Pokémon Y, you’ll be unable to transfer it back to Pokémon Omega Ruby, Pokémon Alpha Sapphire, Pokémon X, or Pokémon Y.
You can’t deposit Pokémon holding items into Pokémon Bank. If you try to deposit a Pokémon with a held item, that item will be sent back to the original game.
Pokémon Bank Fee is $4.99 a year
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BASICALLY, don't transfer over any Pokemon after the update that you don't want back in XY/ORAS. Anything transfered over won't be able to be transferred back
"Strong Pokémon. Weak Pokémon. That is only the selfish perception of people. Truly skilled trainers should try to win with their favorites." - Karen of the John Elite 4