Does Iron Fist power up Power-Up Punch?

Question

I have a Golurk with the Ability Iron Fist
It also has Power-up punch
Will Iron fist upgrade Power-up punchs power?
If so how much does it upgrade
BTW Power-up punch has 40 base power and raises the attack after it is used

Answer 1

Yes Iron Fists increases the Power of Power-Up Punch by 20%.

So with the Iron Fist Ability the Power of Power-Up Punch will be increased from 40 Base Power to 48 Base Power.

(40 x 1.2 = 48)

It will also raise the users Attack by 1 Stage.

Source

Answer 2

Yes, it ups the power of Power Up Punch

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Bulbapedia-Iron Fist

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Hope I helped!!