Sorry for capitals on always, the reason for it is if it could let you attack pokemon before they use protect/detect?
No. it can't. the reason:
Quick Claw is the most common one you will see. It has a 3/16 chance of boosting your Pokémon's priority and attacking first. However, this is not utilised in skipping priority stages. So if you have a Quick Claw attached and it activates while you use Flamethrower, but your opponent uses Quick Attack, you will still attack second.(http://www.serebii.net/games/speedpriority.shtml)
