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Deals damage and lowers the user's Special Attack by two stages.
Leaf Storm is powerful, but its side effect limits its use to Choice sets, or hit-and-run style attackers. That said, the move packs quite a punch, and is a staple choice on Grass-types such as Celebi and Rotom-C.
Giga Drain is a weaker option with 75 Base Power that has 100% accuracy, restores HP, and does not lower the user's Special Attack.
Energy Ball is a weaker option with 80 Base Power that does not lower the user's Special Attack.