you catch cobalion
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if it is not breakable it cant be moved
the ghost Pokemon in black and white are Frillish, Jellicent, Litwick, Lampent, Chandelure, Yamask, Golett, Golurk those are the only ghost type Pokemon in Pokemon black and white.
If you're talking about the small, rugged rocks, then I don't think you can. The only rocks I know you CAN move/break are the huge boulders made for Strength.
A pokemon that knows Charge can, but you will need to get a pokemon from Pokemon White that knows Charge. Same goes for those who own Pokemon White, you will need to get a pokemon that knows Charge from Pokemon Black to activate the time machine.
If you are talking about the rocks in Pinwheel Forest or Victory Road, these are only removed once you encounter Cobalion in its cave, on Route 6 (needs Surf).