Glaciate (こごえるせかい, Frozen World) is a damage-dealing Ice-type move introduced in the fifth generation. It is Kyurem's signature move, but certain event Victini might know the move.
The user inflicts damage and lowers the opponent's speed by one.
BWB2W2 - The user attacks by blowing freezing cold air at opposing Pokémon. This attack reduces the targets' Speed stat.
XYORAS - The user attacks by blowing freezing cold air at opposing Pokémon. This lowers their Speed stat.
By leveling up
Victini - Distributed November 25, 2012 to January 3, 2013 at Japanese Pokémon Centers.