Noise Crush

Noise Crush is Shade Man's power. It sends a sound wave to damage enemies. To charge it up, bounce a wave off a wall back at yourself. It will do more damage to enemies.

Robot Masters And Bosses Weak Against Noise Crush/Crash Noise

 * Turbo Man: Mega Man 7 and Mega Man: The Power Battle
 * Bass (Wily Stage 1): Mega Man 7
 * HannyaNED²: Mega Man 7
 * Stone Man: Mega Man 2: The Power Fighters

Trivia

 * The Noise Crush is called Crash Noise in Mega Man: The Power Battle, and Crush Noise in Mega Man 2: The Power Fighters.
 * If you fire the Noise Crush and slide immediately afterwards, you can absorb it without having to fire it against a wall. Note that this only applies to Mega Man 7.  This has been fixed in both arcade games.
 * Do NOT use the Noise Crush against Shade Man. He'll just absorb the sound wave and shoot it back stronger.