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Has a high critical hit rate.
Razor Leaf is the best Grass-type move with no drawbacks. It has a high critical rate, meaning Venusaur will get a lot of critical hits using this attack, and it will bypass negative and positive boosts, being a very good move to deal with Amnesia Slowbro.
SolarBeam is a two-turn stronger alternative.
Mega Drain is a weaker alternative that heals the user half the damage done.