Sovereign09

My username is Sovereign09 and I traded a player named Cerberuskmf so their machoke could be evolved on the gold server but didn't know they caught it in johto and now it's locked into my PC and I can't give it back. I got logged out while trying to figure out how to resolve the issue and lost the chats. The person put a lot of effort into EV training it and I just want to get it back to them. Any help would be appreciated. I have enclosed a screenshot of the machoke in question. Zoruami: Pokemon restored.