The GTS is in every Pokemon center up the stairs. I believe the one closest to the big spinning globe besides the one in the elite four.
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Go to the GTS and if you have Munchlax in your Pokedex, send in a Pokemon and ask for a Munchlax.
you cant catch it you have to get it from a friend that has Pokemon black or get from a gts tradeYou can't the only way to get Tornadus in Pokemon White is by using cheats or by trading it from Pokemon Black.
No, I don't think there is a way.
You cannot catch Shaymin in Pokemon Black or White. You'll need to trade for it from the GTS or transfer it from the Transfer Lab.
You can fight Cynthia in black or white after you beat the elite four and ask for him/her at GTS.