Calculation of Critical Hits is NOT based on Speed, as was the case in RBY.

A Critical Hit doubles the amount of damage done to the opponent by ignoring statistical modifications. During a Critical Hit:

- If the Defense stat stage for either Pokemon is greater than 0, it temporarily becomes 0.
- If the Attack stat stage for either Pokemon is less than 0, it temporarily becomes 0.

Determining Chances of a Critical Hit

A Critical Hit is based on value n and a random number. If the random number is less than n, then the attack is a Critical Hit. But how is n decided?

If Chansey is equipped with Lucky Punch, n=2. If Farfetch'd is equipped with Long Leek, n=2. If neither is true, n=0.

If Focus Energy has been used, then add 1 to n.

If the attack is Karate Chop/Razor Leaf/Crab Hammer/Slash/Aero Blast/Cross Chop, then add 2 to n.(Add 0 to n for any other attacks.)

If Scope Lens is equipped, add 1 to n.

After determining n, you'll get a Critical Hit (CH) number:

n CH Number

0 17

1 32

2 64

3 85

4 128

If the random number (from 1 to 256) is less than the CH Number, then the attack is a Critical Hit.