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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 type-resistance Berry item, 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.