It's not impossible, but it's hard enough getting the game complete as is. On top of that, it would almost certainly require us to run a server dedicated to matching these trades/battles up, unless it's purely peer to peer, which is tricky in its own right, and not neccessarily the most user friendly. There may be scripts out there for it, but I haven't seen any publically available ones that are used enough that it seems safe to use then without combing through the whole to make sure we wouldn't be sedning out malware.