Mega Man Battle Network 2/Bosses

Level 1 - Air Vent

 * Boss - Air Man
 * Element - None
 * Hp - 300
 * Attacks -

Level 2 - Okuden Dam

 * Boss - Quick Man
 * Element - None
 * Hp - 400, 600(V2), 800(V3)
 * Attacks
 * Boomerang
 * Curved Boomerang (V2 upwards)
 * Slash (done when HP is low, V2 upwards) - 200 Damage

Recommended Strategies
Quickman is quite tough for an early boss, since he can't be hit when he's standing still, or hopping from square to square. You can only hit him when he's unleashing an attack. Fortunately, he doesn’t have too much Hp, which is his weakness, so hit him with chips like Gutsman (or Airman, if you got it from his ghost) which are high power chips at this stage of the game, and you should be able to defeat him.