Clamp causes damage for 2 to 5 turns, typically using only 1 PP. During
this time, the enemy can't use any attack.
The attacker cannot cease Clamping until the attack runs its course, or
the victim faints. If the victim's trainer has other viable Pokémon
remaining on his team, he can switch Pokémon while the Clamp attack
continues. However, the Clamping Pokémon will immediately attack again
(using up another PP) and have a chance to immobilize the new victim.