I don't know about Pokemon Black and White, but in Generation IV the strongest ghost move is Shadow Force, but only Giratina can learn it. A decent ghost move is Shadow Ball if you can't get an Action Replay DS.
Well each legendary can be strong, depending on how you train it. But I would say that Arceus is the strongest because it can be any type. Even the "???" type, like the move curse. Arceus cannot be the "???" type unless hacked. But yes, Arceus is the strongest legendary in terms of stats.
The covalent bond is the strongest.
a truss bridge is the strongest
Neodymium Magnets
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It is a ghost type move.
Shadow Force (Power: 150)
The strongest Dark type move in terms of potential power is Punishment at 200 power though has a very big draw back to reach that power. The strongest Ghost type move is Shadow Force at 120 power. The Strongest Bug type move is Mega Horn at 120 power. Psychic and Dark Type Pokemon are indeed weak to Bug type moves.
Pidgeot is a Flying type and the strongest Flying type move it can learn is Sky Attack.
A ghost type move.
With a ghost or dark type move.
earthquake
The strongest type is Bug, Ghost, and Dark
The move is Doom Desire
the strongest electric type move is volt tackle
no.
shadow ball is the strongest ghost TM