Giving your Pokemon items to hold is one of the most important things you can do to boost up your power in Pokemon Brilliant Diamond and Shining Pearl. They can self-heal with berries, randomly go first even if they're slow with the Quick Claw, and even boost up their power immensely with the Choice Band.
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The Destiny Knot, however, is rather unique in that it has an effect in battle but it also has an effect outside
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