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Boosts the user's Defense by one stage.
Harden is an utterly useless move and should never be used seriously. Its only value is the comedic one when used by Metapod, and that got old about twelve years ago. Don't use this move.
Acid Armor has less PP, but raises Defense by two stages.
Barrier has less PP, but raises Defense by two stages.
Reflect doubles the Defense stat up to 1024 Defense instead of 999.