Roost is no longer a TM in generation V. In genertaion IV, it is TM 51.
To get a Pokemon to learn Roost when they could not learn through leveling up you'll need to breed with a male pokemon that knows the move.
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You can't find swords dance as a TM in Pokemon Black
Salamence learns Roost via TM. If you have used up your Roost TM, you can breed a male Pokemon of the Dragon Egg group that knows it to a female Bagon, Shelgon, or Salamence.
You cannot get the TM/HM Whirlpool in Pokemon Black or White.
You get the TM Ice Beam in the Great Chasm.
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