Pokemon GTS

I have a problem, when I'm on the GTS website I see pokemon for trade and what pokemon they want. So I go onto the GTS in the game and I can't find those offerers!Example:
Someone is offering a Chikorita and wants a Vulpix and is from the USA. I go onto the GTS search for Chikorita in the USA and that one doesn't come up. =SAnyone know why?
EDIT: Also, how do I know when my trade is done if I have a pokemon for offer on the GTS?

IIRC GTS website isnt real time.....

wich means? (sorry if I'm asking the obvious...)

Don't even bother looking at the GTS website. It's just there for looks and to me is completely useless.

I didn't even know we had one that took the data from the games and posted them (even if it is half-assed).