New Forms in Union Room question

If this code was used in that room by Player-A, and a Platinum-to-Platinum trade transferred a Mow Rotom to Player-B, would Player-B get a Mow Rotom or just a regular Rotom?

Never mind, I interpreted the question wrong. I think player B would get a mow rotom, because the game performs the check before they go into the union room or on wifi, not afterwards.

Well this should probably be tested.

I did a test when I first made the code and shaymin got turned to regular form when I tried to trade it. But it was fine as long as I did not trade it (battling). I did not check to see the extent of this, though.

I tried the code recently, and I don't think it works at all. All five of my new Rotoms were turned into the original form.

I decided to join here after seeing this question, so first post for me here.

On topic: All new forms for rotom and shaymin will be reverted back to its original form while entering the union room. This does not effect giratina because he holds an Item to change forme. I believe this was stated by the pokemon company too, not sure where though.