On the second turn, the user hits the target with electrically charged ice. This may also leave the target with paralysis.
Freeze Shock requires a turn to charge, then on the next it is executed, doing damage and having a 30% chance to paralyze the target. In a Double Battle, Freeze Shock can target any Pokémon around the user. In a Triple Battle, Freeze Shock can only target a Pokémon that's adjacent to the user.