Sometimes, people cheat. It’s a fact in both games and life. Fortunately, or unfortunately for some, the PokeBank doesn’t catch all cheaters. The Pokemon Bank will catch the most aggregious of offenders, but lets certain altered pokemon pass right through the gate.
I will admit right here and now – I am a Pokemon cheater. I used Action Replay with Pokemon Black to get some shiny Pokemon. I also used it to trigger battles with special event legendaries I normally wouldn’t be able to catch. Now that the PokeBank is North America, I was curious to see what would and wouldn’t get through the filter.
The good news is, if you used an Action Replay code to make shiny Pokemon appear in the wild in Pokemon Black, White, Black Version 2, or White Version 2, then they’ll transfer over. You can even use a code to make all Pokemon appear randomly in any area of the game and be shiny, and they’ll go through the Pokemon Transporter and Pokemon Bank just fine.
However, there are two kinds of Pokemon that won’t go through. The first is a Pokemon that is in an evolved form before it could ever have evolved. The PokeBank will catch that right away. The Pokemon Bank will also catch fraudulent legendaries. If it’s one that wasn’t acquired legitimately, it won’t make it through the filter. (I had to say a tearful goodbye to my adorable Meloetta. You’ll always be legitimate to me!)
Fortunately, nothing really bad will happen if you try to transfer over a Box 1 from Pokemon Black, White, Black Version 2, or White Version 2 that has an offending Pokemon in it. The PokeBank will just show a message saying that at least one Pokemon in the box can’t be sent because there is a problem with it. The other Pokemon will be uploaded to the Pokemon Bank. The offending Pokemon won’t go anywhere. They’ll remain in your DS game.
Site [Pokemon Bank]