<b><i><font color="#979C1F">Insert Purpose of Meaning</font></i></b>
I think that trades in general are beneficial to whatever version you may have, for completing the PokeDex and collections sake. Another thing, in Generation 2's GSC, they had the Weekly Lottery in Golden Rod's Radio Tower. Back then doing as much trading as you can possibly can was crucial for the sake of a winning lot, as getting different ID's/OT's to match the Lotto Number would eventually get you a win.
I really have to play through the Generation 5 games to get more of a experience in the world of trading.
When I have time that is. :O
Also, Great Post Jelli! :D