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Deals damage. Its Base Power depends on the difference between the Speed of the user and that of the target. Base Power is calculated thus:
Base Power = (Target's current Speed / User's current Speed) * 25, rounded down, + 1, but not more than 150.
Gyro Ball is an excellent attack for naturally slow Steel-types. Popular users include Forretress, Bronzong, and Ferrothorn, all of which don't mind moving second and love the extra power Gyro Ball brings. It is important to use a Speed IV of 0 and a nature that reduces Speed when using Gyro Ball to ensure the attack strikes at maximum power.
Electro Ball is a similar move whose Base Power is higher if the user's Speed is higher than the target's Speed.