Need to retrieve a pokemon from a trade with a friend

[Scald]

Hi i got a problem with a trade with my friend, we are new in this server and i want helped him so he decide to trade one of my pokemon for an easier story.

but my pokemon came from kanto gold that he is currently in Hoenn we would like to know if it was possible with his agreement that I can recover because I finished the game and I had to pass it to another friend, its a Haunter level 99, my pseudo is Rqvk001 and his pseudo is Ryzow

[Scald]

in the gold server"

[Ryzow]

I am currently in Hoenn and my buddy Rqvk001 wanted to help me by lending me his Haunter so that I make it evolve and make the adventure of Hoenn with but it turns out we had not think of the fact that I do not will not be able to use it, I would like to know if with my agreement we will be able to return to him so that it can make level 100 rise and used it? it's a level 99 haunter and it has the OT Rqvk001