Yea you can get both of those moves on Scraggy. You just have to make sure you one knows Ice Punch while the other knows Dragon Dance to pass down the moves together.
Scraggy Egg Moves <- Use that to assist with the breeding, but if you have any other questions, do ask.
And about the Power Items, you're using it pass down certain IVs that you intended to. For example, if I give a mon a Power Bracer, the Attack IV of that mon will be passed down. In order to get HP Ice, you need to have a certain set of IVs to get it, thus you should use the Power Items as well as the Destiny Knot.