Azithromycine

Hello, I'm playing on the Gold server, me (Azithromycine) and Paulosantos decides to mutual trade our Machoke to get a Machamp but his is from Johto which I did not do yet. So I can't trade him back his pokemon. I would appreciate help for him to get back his pokemon. Edit: He kept my Machamp while he waits for his. Thank you in advance