At the start of Blockman's stage, you will reach a raised platform. Just after two slow-moving enemies spawn, two more will spawn ahead. From this raised platform, you can simply run back and forth, respawning each set of small enemies. They are very easy to kill, and you can just keep running back and forth to keep them spawning infinitely. Repeat this trick as many times as desired. Note: Purchase the Bolt Catcher in Dr. Light's Lab as early as possible. This item causes bolts to appear more frequently in stages.

Go to Wily Stage 2, then reach the second room. There is a conveyor belt with three enemy spawners. Enemies will continuously spawn from three generators. A fourth enemy will also spawn from the ceiling. Just let a dozen or so enemies spawn, then kill them all with charged shots. The power-ups and bolts will drop onto the conveyor belt and slide over to Mega Man. Repeat this as many times as desired.