Answer 1

Shadow Punch as it has higher attack, and as a bonus it never misses

Answer 2

Shadow Punch is a really good move to have since it is a stab move and golurk has high attack.Moreover,it will get powered up if golurk has iron fist as ability.

Shadow Punch is the best in my option.

Answer 3

If you have iron fist ability and a high attack shadow punch would be good.A higher special attack and klutz would be better for shadow ball.Either way is good.