I'm sorry, but, "Get a girlfriend" is not a very good answer. First, go to Jubilife City. Go to the condominiums. Talk to the blonde girl sitting next to a pachirisu and a pikachu. There you go!
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a quick claw is what you give a Pokemon to increase itsspeed
If you want to get quick claw in D/P or Platinum you will have to get it from R/S/E and migrate a Pokemon holding it
Go to the Condominiums in Jubilife city. On the first floor, talk to the blond girl standing next to the two pokemon. She'll give you the Quick Claw.
Quick Claw increases the possiblity of your Pokemon attacking first in battle.
You can get the quick claw in the safari zone.