Well, I noded tips for beating Mega Man 2, now here's a Mega Man 3 equivalant. I find this the hardest Mega Man of all, but the Wily stages are considerably easier than in others. the Mega Man 2 bosses are damn hard though.

this is from www.world-of-nintendo.com
Boss damage chart

Sent in by Jean-Philippe Larivire

Number of shots to kill _______ with the: 

Abbreviations: 
AC : Arm Cannon
SSH: Spark Shock
SSN: Search Snake
NC : Needle Cannon
HK : Hard Knuckle
TS : Top Spin
MM : Magnet Missile
GB : Gemini Beam
SB : Shadow Blade

X : No damage

AC SSH SSN NC HK TS MM GB SB

28   7   X 14 14 28  X 28  7     Spark Man
28  28   7  7 14 14  X 28 14     Snake Man
28   X  28  7  X 28 28  4 14     Needle Man
28   X   X  X  7  X  7 28  X     Hard Man
14  28  28 14  4  7 28  X 28     Top Man
14   4  28 28 14 28  7 14  4     Magnet Man
28  28   6 28 14 14 14  7 14     Gemini Man
28  28  28 28 14  4 28 28  7     Shadow Man


28  14   X  X  7  X  7 28 14     Metal Man
14   7  28 28 14  X  7 14  X     Air Man
28  28   7  7 14  X  X 28 14     Wood Man
28   X  14  7  X  X 28  7 14     Flash Man
28  28   7 28 28  X 14  7 14     Quick Man
14  28  28 14  4  X 28  X 28     Crash Man
28  28  28 14 14  7 28 28  7     Heat Man
28  7   X  14 14  X  X 28  7     Bubble Man


Use AC           Turtle
Use HK           Rock Man
Use AC           Mega Clone
Use AC           Dr. Wily 1-1
Use Rush Jet     Dr. Wily 1-2
Use SB           Dr. Wily 2-1
Use TS           Dr. Wily 2-2