>>28348548Most people who trade on GTS are looking for either: Absurd, obvious injections (Want: Level 1-10 Genosect for my wheedle!) or just to fill in a hole in their pokedex (Want: Gorebyss, Offering: Huntail)
The second kind disappears from the GTS within a few minutes of being posted.
The secret is to just search for whatever it is you want, and, if you scroll through a bunch of people asking for Darkrai or Mew, just quickly do the search *again*, and you'll start seeing reasonable offers.
That said: if you've got a really large number of holes in your pokedex, breed up some 5+ IV pokemon with a mega / signature move, and wonder trade a box of those or three, that's a good way to build trade fodder.