Rollout is an exponentially powerful Rock-type move introduced in Generation II. If the user has already used Defense Curl, then this attack's base power and its 5-turn intensity becomes effectively doubled. It is one of the most powerful Rock-type moves in Pokémon.
While Rollout is a very powerful move, it has two drawbacks - firstly, if at any point the attack misses, it ends. Secondly, unlike Fury Cutter, the user cannot do anything else while the attack is being used, which includes using items.
A favorable aspect of Rollout is that it only uses 1 PP, regardless of how many times it successfully hits.