Rain Flush

Rain Flush is Toad Man's power. This creates an acid rain storm that affects all things on the screen (provided they are vulnerable to it).

Robot Masters And Bosses Weak Against Rain Flush

 * Bright Man: Mega Man 4 and Mega Man IV
 * Charge Man: Mega Man IV
 * Wily Machine: Mega Man for the Sega Game Gear

Trivia

 * The Rain Flush can be used as a substitute against Pharaoh Man if one has run out of Flash Stopper, though you'll have to contend with Pharaoh Man's speed.
 * If you use the Rain Flush on Wily as he escapes the first battle on Mega Man 4, he will be destroyed, but as a result you will be stuck on the stage unless you reset.