Rollout will continue to attack every round until it misses. The base power of Rollout will double every round until the 5th round of the attack, after which it will reset to the base power of 30. The damage progression is as follows:
30->60->120->240->480
In addition, a pokemon that is currently receiving the benefits from Defense Curl, either by using it on its own or if the effects have been Baton Passed, will have the base power of Rollout doubled. Unlike what has been reported in some places, this benefit is not just right after Defense Curl has been used, it is as long as the benefit of Defense Curl is lost, by fainting, Haze, or standard switching. The progression for a Defense Curl aided Rollout is:
60->120->240->480->960
Rollout receives the flinching bonus when King's Rock is attached to the using pokémon.
Rollout is affected by Brightpowder when the opposing pokémon is equipped with it.