x2
-30SmackGyro BallSwitch this Pokémon with 1 of your Benched Pokémon. If you do, your opponent switches their Active Pokémon with 1 of their Benched Pokémon.
Some believe it to be a deity that summons rain clouds. When angered, it lets out a warning cry that rings out like the tolling of a bell.
What happens if I use Bronzong's "Gyro Ball" attack but I don't have any benched Pokemon?
You have to switch Bronzong if you are able to; the "if you do" part refers to when you have no Benched Pokemon. So if Bronzong doesn't switch the opponent's Active Pokemon doesn't switch either.
The version of "Gyro Ball" attack on Forretress says "you may switch..." as an optional action, but the version of "Gyro Ball" on Ferrothorn indicates the switching part of the attack is mandatory. Which way is correct?
The effect may vary from card to card, so you should play each attack as it is written on its card. So for Forretress the switch is optional, but for Ferrothorn it is mandatory.