Hello, the ROM works correctly with the bank, and regarding the way to speed up the process, what I can recommend is that with Pkhex you load the pokemons in your Pokemon X game and from the bank you take them all. Make sure all pokemon are legal.
All the best.
Good afternoon, firstly, there is no need to write everything in capital letters and secondly, attach the save file that is giving you the problem. With such generic information and without the file, I don't think anyone can help you.