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Deals damage. This move ignores the target's defensive stat stage changes, including accuracy and evasion modifiers.
Since Defense-boosting moves are not that common, and evasion boosts are banned, Return is usually a better option for your Normal-type STAB move, as it's more powerful. It can be used for more damage against Bulk Up and Curse users, however, such as Conkeldurr, but this is situational at best.
Return is a more powerful Normal-type alternative.
Double-Edge is an even more powerful Normal-type alternative; however, it inflicts recoil damage after each use.