I've got thousands of trades on the GTS. When saikyou pokes were common on there, I had at least 2 full boxes of them at one points XD Anyways, as for some of the best...
The floatzels I mention in my sig. I've only ever received one hack, which was Crashers :P All of those are form the GTS, legit, and most are foreign. Yay bojeltn and musteflott!
Random shiny scan, I came across a shiny female houndour, ended up being timid w flash fire. All it cost me was any male piplup. Surprisingly had time to breed one. Probably cause it was French and didn't show up without plats "by country" search. (Yay Malosse)
My best to date, I can't remember what I put up to offer, but someone sent me: Shiny female hasty typhlosion, lv 100 EV'd 255 sp att 255 speed, 31 sp att 25 speed IV, nicknamed "ablazing" or something along those lines (japanese)
Shiny floatzels from GTS: 39
Autumn Friendly: 18-4 4 RQ, 1657, 578th place
International challenge: 16-2 7 RQ 1634
Spring friendly: 18-0 1721, 173rd