From Bulbapedia, the community-driven Pokémon encyclopedia.
The Sky Drop glitch is a glitch in Black and White Versions that occurs in Double and Triple Battles when Gravity is used while two Pokémon are in the semi-invulnerable state due to Sky Drop. Due to the glitch, the move Sky Drop was banned in Wi-Fi Random Matches starting November 10, 2010.
The glitch is activated when Gravity is used while two Pokémon are in the semi-invulnerable state after Sky Drop is used. Gravity will bring the user of Sky Drop down while the target will be stuck in the semi-invulnerable state, unable to move until the user of Sky Drop is knocked out or switched out.
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