From Bulbapedia, the community-driven Pokémon encyclopedia.
Screech (Japanese: いやなおと Unpleasant Tone) is a mostly accurate non-damaging Normal-type move introduced in Generation I.
Screech decreases the opponent's defense by 2 levels.
Screech will do nothing if the opponent's attack has reached a level of -6 or a value of 1, and
will fail if the opponent has a substitute or is under the effect of Mist. The effect of
Screech is ignored by critical hits.
In the anime
Golbat. Golbat opens its mouth and a glass-shatering shriek is released.
In other languages
Spanish: Chirrido, French: Grincement, German: Kreideschrei.
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