No pokeball dropped? Did you change your internet settings and save them? If not, you will just go to the normal nintendo GTS. If you did change the settings correctly, you should either have a pokeball drop or get an error message if the pokestation GTS is down.
As far as looking legal, it depends on who is doing thechecking. I use the BW pokemon on the GBU and they usually pass the GBU hack checks, but you can't use these legendaries on the GBU, so I am not familiar with what kind of hack checks you would be subject to, so I can't guarantee anything. Besides, like I said honesty is the best policy. If legal hacks are not allowed, I would not chance it.