Actually, I've already done research into this. It's just a bunch of people showing off their pokes. You can improve your chances of finding something worthwhile if you change your search location.
Well, you know how certain Pokémon, like Kadabra or Scyther[w/ Metal Coat] need to be Traded to evolve, yes? Well, with the Gen IV GTS, you'd put the Pokémon tat neds to Trade-Evolve on Offer, trade another Pokémon[through Search,] and take it back. Or, wait 24 hours and take it back.
Whoa bro, better slow down bro, don't wanna be a bro, bro.