Miqirengar

Hey, A few minutes ago I traded my Haunter to a friend in order to evolve it into Gengar. However, said Haunter is now stuck in his box and he cannot trade it back to me. Haunter was caught in Johto and he is still in Kanto, so that's most likely why it is locked. I would be incredibly grateful if there were a way to restore my Haunter as it might take a while for him beat Kanto. I had hoped to use Gengar to beat Johto E4 and move on to the next region. Our igns are Miqirengar and Blnserpens.