Gyro Ball formula

[Gardevoir]

Is there a formula for calculating the damage using Gyro Ball?

The last time I heard was Base Power = Opponent Speed * 25 / User Speed

But this is from four months ago, when it was still unconfirmed. Is this right?

 

[Hipmonlee]

This is a simple question, it belongs in the simple questions topic.

Have a nice day.