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For example: My Ferrothorn uses Power Whip and its attack stat was 312. How much attack would it actually have? How would I calculate it? And also, how does my opponent's defense stat factor into this?

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It depends on the Defense stat of the Pokemon you're hitting.
o  yeah *heh* oops edit time

2 Answers

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Best answer

Let's start with the brute force formula.

Damage = ((((2 Level / 5 + 2) AttackStat AttackPower / DefenseStat) / 50) + 2) STAB Weakness/Resistance RandomNumber / 100

In this the random number is somewhere between 85 and 100, where the 85 value represents minimum damage, while 100 represents maximum damage.

Stat boosts are also calculated in this fashion:
-6 levels: 25%
-5 levels: 29%
-4 levels: 33%
-3 levels: 40%
-2 levels: 50%
-1 level: 66%
0 levels: 100%
1 level: 150%
2 levels: 200%
3 levels: 250%
4 levels: 300%
5 levels: 350%
6 levels: 400%

Source
Hope I helped!

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Where do critical hits come in this?
Critical hit ratio is added to the resultant damage by 33%
Say your resultant damage is 50; then this is how it will go: (50 * 33/100) + 50  = 66 + 50 = 116 damage
OK so basically you mean at the end of all the other calculations. (And it would be 50% if it were before gen VI)
1 vote

To calculate damage, this is how you do it:

Damage = ((((2 Level / 5 + 2) AttackStat AttackPower / DefenseStat) / 50) + 2) STAB Weakness/Resistance RandomNumber / 100

So, in your case, since you are using power whip, this is the calculation:

Damage = ((((2 Level / 5 + 2) 312 120/ DefenseStat) / 50) + 2) STAB Weakness/Resistance RandomNumber / 100

Random number is a random integer number between 85 and 100, called roll damage. Since you haven't told me the defending Pokemon, or your Ferrothorn's level, this is as much as I can tell you.

Hope this helped!

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