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If holding a rock that extends weather duration, plate or z-crystal of the correct type; Water - Rain, Ice - Hail, Fire - Sun, Rock - Sandstorm; that weather starts automatically on switch in.
Gains a rock type transformation.
Under rain, Sp. Defence increase by 50 BST.
Under sun, Speed increase by 50 BST.
Under hail, Sp. Attack increase by 50 BST.
Under sand, Defence increase by 50 BST as well as Sp. Defence double from being a rock type.
Sand advantage is due to other weathers boosting and weakening moves where sand is just chip damage and accuracy lower for some moves.
