Deals damage. After the user makes contact with the target, it immediately switches out. The player then selects and switches in a new Pokemon, who carries on the turn. Does not force the user to switch out if there are no more active Pokemon on the user's team, if Volt Switch KOes the target's last Pokemon, or if the target switched out using an Eject Button.
Haha I found it Poke'Slash.
Source