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If sun is the prevailing weather condition, the wielder cannot be afflicted by status conditions. Leaf Guard also prevents drowsiness and the use of Rest in sun. Leaf Guard will not cure previously existing status conditions when sun comes into effect.
Really, Leaf Guard is a situational ability that is generally worse than other options. Leafeon gets it but would rather use Chlorophyll, and the same applies to Tangrowth, except it also gets Regenerator. Thus, it is pretty much the worst of the beneficial sun abilities.
Found in Dream World