Is Freeze Dry 4x on Gyarados?

Question

Because of its weird effect, is Gyarados hit 4x by Freeze Dry?

Answer 1

In theory, i'd say yes. It gets rid of the ice resistance to make a weakness, and thus it doesn't have the ability to resist ice, giving the weakness to flying as well as the weakness to water.

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I ran a test here. Shock wave did about the same amount of damage, and it has nearly the same base power. So far, yes.

>0 SpA Sunkern Freeze Dry vs. 4 HP / 0 SpD Gyarados: 84-100 (25.3 - 30.1%) -- guaranteed 4HKO
0 SpA Sunkern Shock Wave vs. 4 HP / 0 SpD Gyarados: 84-100 (25.3 - 30.1%) -- guaranteed 4HKO

On that calc, I can set the base power of Shock Wave to be the same as Freeze Dry. It appears that Freeze Dry does in fact do 4x damage to Gyarados.

Answer 2

Yes. Freeze Dry deals x2 damage to both water and flying types. Gyarados, being both water and flying, will take x4 damage.

Source