Hyper Bomb

Hyper Bomb (ハイパーボム) is Bomb Man's special weapon. When Mega Man uses this weapon, he throws bombs in a small arc (so it takes some practice to get used to throwing them). There's a small time delay between when a bomb is thrown and when it explodes, but it has a decent-sized explosion that damages or destroys anything within the blast.

Bosses Weak Against Hyper Bomb

 * Guts Man: Mega Man
 * Copy Robot: Mega Man
 * Buster Rod. G: Mega Man: The Wily Wars
 * Mega Water. S: Mega Man: The Wily Wars
 * Hyper Storm. H: Mega Man: The Wily Wars
 * Wily Machine 3: Mega Man: The Wily Wars
 * Ice Man: Mega Man: Powered Up

Bosses That Can't Be Attacked By Hyper Bomb

 * Yellow Devil: Mega Man
 * Wily Machine: Mega Man
 * Buster Rod. G (2nd Encounter): Mega Man: The Wily Wars
 * Fire Snakey: Mega Man: The Wily Wars
 * Wily Machine 1 and 2: Mega Man: The Wily Wars

Other media
Mega Man uses Hyper Bomb in the first episode of the Mega Man animated series. In the cartoon, its firing mechanism has two circles, probably to hold the bombs.