For three turns, friendly Pokémon have doubled Speed.
For the next three turns, all Pokémon on the user’s side of the field have their original Speed doubled. This effect remains if the user leaves the field.
Move descriptions from different games
"The user whips up a turbulent whirlwind that ups the Speed of all party Pokémon for three turns."
"The user whips up a turbulent whirlwind that ups the Speed of all party Pokémon for three turns."
"The user whips up a turbulent whirlwind that ups the Speed of all party Pokémon for three turns."
"The user whips up a turbulent whirlwind that ups the Speed of all party Pokémon for four turns."
"The user whips up a turbulent whirlwind that ups the Speed of all party Pokémon for four turns."
"The user whips up a turbulent whirlwind that ups the Speed stat of the user and its allies for four turns."
"The user whips up a turbulent whirlwind that ups the Speed stat of the user and its allies for four turns."
"The user whips up a turbulent whirlwind that ups the Speed stat of the user and its allies for four turns."
"The user whips up a turbulent whirlwind that ups the Speed stat of the user and its allies for four turns."
"The user whips up a turbulent whirlwind that ups the Speed stat of the user and its allies for four turns."
"The user whips up a turbulent whirlwind that ups the Speed stats of the user and its allies for four turns."
"The user whips up a turbulent whirlwind that ups the Speed stats of the user and its allies for four turns."
"The user whips up a turbulent whirlwind that boosts the Speed stats of itself and its allies for four turns."
How move stats changed over generations
Detailed effect when used in super contests
"Enables the user to perform first in the next turn."