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Boosts user's Defense one stage.
There is not much competitive value in this move. It's outclassed by other moves that raise the Defense stat faster, like Barrier. In short, there is literally no situation in which you could ever use this move.
Barrier is a Psychic-type equivalent that raises Defense 2 stages.
Acid Armor is a Poison-type equivalent.
Reflect doubles the Defense stat up to 1024 Defense instead of 999.