The holder&#39;s critical hit ratio counter is increased by one.
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When <a href="http://pldh.net/dex/monster/sneasel" class="linksred">Sneasel</a> holds this item at night and levels-up it will evolve into <a href="http://pldh.net/dex/monster/weavile" class="linksred">Weavile</a>.