are you struggling with weaknesses? read this to help know weaknesses
here is what weapon belongs to what robot master
Space man: aiming globe
Frozen man: frozen dash
Puzzle man: Puzzle power
Tune woman: synth burst
brave man: brave hound
sultan man: hunter mine
batik man: canting batik
marine man: marine flow

Space man(edit of gyro man) weak to marine flow
Frozen man(edit of charge man) weak to aiming globe
puzzle man(edit of gravity man) weak to frozen dash
tune woman(edit of napalm man) weak to puzzle power
brave man(edit of stone man) weak to synth burst
sultan man(edit of crystal man) weak to brave hound
batik man(edit of star man) weak to hunter mine
marine man(edit of wave man) weak to canting batik

rounder(sub boss in tune womans stage) is weak against any weapon
dark man 1 is weak against synth burst
dark man 2 is weak against super arrow
dark man 3 is weak against brave hound
dark man 4 is weak against marine flow
big pets is weak against aiming globe
circling Q9 is weak against hunter mine
wily press is weak against synth burst
wily machine is weak against canting batik
wily capsule is weak against super arrow

this will help you very much, hope you enjoy