Pokémon Black Version Glitches

Sky Drop Glitch
While the user of Sky Drop and the targeted Pokémon are in the air, if another Pokémon uses the move Gravity, the move fails. Sky Drop's user will be able to continue to battle as normal, but the Pokémon targeted by Sky Drop won't be able to move until the user of Sky Drop either faints or gets switched out, or the targeted Pokémon takes a hit from an attack.

Sky Drop was banned from random Wi-Fi battles as a result of this glitch.