This is certainly not a new idea, but I think with the mail advances that we got, we can make this happen now.   The plan is the following: You can loan pokemon by mail to any user, in your list or not. That pokemon will appear transparent in your PC, with you being unable to use it until it returns, and a message saying it is on loan for x more hours/minutes.   The loaned pokemon is transferred to the said player, holding a special ribbon that does not allow it to be traded or bred. It can