Yes silk scarf can be used over and over again.
although why bother with that when you can run lifeorb- and it powers up all your moves, whilst silk scarf only boost normal type moves.
heres a powerful moveset:
nature: timid (faster than arcanine)
- tri attack
- darkpulse/ nasty plot
you dont want to be walled by ghosts. nasty plot for extra power to plow through em or darkpulse to shut em down for good. your choice