Focus Energy is a Normal-type status move with no power and perfect 100% accuracy. When used, it increases the user's critical hit ratio, making it more likely for the user to land critical hits. Originally, in early generations, it quadrupled the critical hit ratio, but in later generations, it doubled it instead. Focus Energy can stack with other critical hit boosting items and abilities, making it a strategic move in competitive play to enhance the damage output through increased critical hit frequency.