How to find out about Tornadus in Pokemon White?

Question

PLEASE READ: I do NOT mean how to catch or find it in the wild,I mean how to find out about it,so that I can get it in my Pokedex and look for it at the GTS.

Answer 1

You can't see it in the game, you have to have a friend ( Or someone here ) with Pokemon Black ( or that traded with someone from Pokemon Black ) trade you their Tornadus via Wifi or Wireless communications, ( The Friend Code trade, not GTS ) then Wa-la~ it's in your pokedex.