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Deals damage and has a critical hit rate one stage higher than normal. Assuming there are no other critical hit modifiers in play, this move has a 1/8 chance to get a critical hit instead of a 1/16 chance.
Leaf Blade is a powerful move, useful for Grass-type physical attackers. Unfortunately, it has low distribution, and therefore is rarely seen in competitive play. However, Pokemon such as Virizion and Leafeon are proficient users of this move, which is their best option for physical sets.
Power Whip is a more powerful, less accurate option.
Seed Bomb is a less powerful option but with far greater distribution.