Croconaw 31

[1] Screech
Until the end of your next turn, if an attack damages the Defending Pokemon (after applying Weakness and Resistance), that attack does 20 more damage to the Defending Pokemon.

[1WW] Jaw Clamp (30)
Until the end of your opponent's next turn, as long as Croconaw is your Active Pokemon, the Defending Pokemon can't retreat, and if the effect of an attack, Pokemon Power, or Trainer card would change that player's Active Pokemon, that part of the effect does nothing.