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Deals damage. It has a 1/3 chance for the move to hit either 2 or 3 times, and a 1/6 chance to hit either 4 or 5 times. If a Focus Sash or the ability Sturdy is activated through one of the hits, another hit will KO the target. Each hit is treated as a separate attack, and thus abilities such as Weak Armor will activate for every hit taken, and every hit has a separate flinch rate if used with King's Rock, Razor Fang, or Stench, and a separate critical hit chance. Color Change will only activate on the last hit of the move. However, the items Life Orb and Metronome treat all the hits as a single attack. If this move breaks a Substitute, the attack can still continue and hurt the target. If the target holds a Chilan or Jaboca Berry, it will only affect the first hit of this move. If the user has the ability Skill Link, this move will always hit five times.
Barrage is a very poor attack overall. Even if all five hits land, it is still no more powerful then a 75 Base Power Normal-type attack. This coupled with its mediocre 85% accuracy and its limited distribution (it is exclusive to Exeggcute, Exeggutor, and Smeargle) makes Barrage a horrible attack with little to no competitive merit.
Fury Attack is an exact equivalent, but it is a contact move.
DoubleSlap is an exact equivalent, but it is a contact move.
Tail Slap is a more powerful move with the same accuracy, but it is a contact move.
Return is a much stronger alternative with no drawbacks.
Double-Edge is an even stronger alternative that inflicts recoil on the user.