Mega Man 3/Doc Man in Spark stage

Spark Man stage
Waiting in the Spark Man stage is Metal Man and Quick Man.

Metal Doc Man
Metal Man, being metal, is vulnerable to magnets. You can make quick work of him with Magnet Missiles.

Quick Doc Man
Quick man is another story. If you remember, it was easy in Mega Man 2 to use Flash Man's Time Stopper which drained half his life before the battle even began. You don't get this luxury. Logic says that Gemini Laser would be the best thing, but that's not the case here. Use the Search Snake to get rid of him quickly, but be wary, as running into Quick Man drains your life quickly.