use you shield. if he hits your shield, up B. if he laser approaches, move with your shield up (aka shielddash). When he comes up to you with the last laser and hes trying to shffl dair, WD outt shield back with a ftilt/utilt. This should be one step to getting the combo started. If he is low, and you get the utilt, you can get a dsmash or ftilt if you feel its too late and you didnt respond fast. spam up B basically on all but platforms. Dair works best from above, and they will come from above a lot. good news is, if they come from above, shield up B is too good. this matchup, much played like fox, is a dsmash hunt--> edgeguard. once you get them off the stage, do your edgeguard thing i.e. ftilts, utilts, fsmash if they phantasm high, etc. bomb to stop phantasm on ledge, forcing up B, edgeguard with utilt or dropped sex kick etc etc too many options too many situations. also, grabs ****. think about it, if he is gonna get random pillars/smashes on you throughout the match, then whatever, youll live. but if you get that grab, that is too good. uthrow to nair/bair is more valuable to samus than most stuff falco can do to a samus who missed a grab at a smart percentage to miss a grab at. if you have a blast, thats even more ownage haha. so anyways, learn to grab, if youre good you wont miss too much. if you did miss, whatever... haha its a good gamble.
note: also if youre already getting pillared, wtf lol falco doesnt have pillar combos on samus, he dairs you, shines you, you go up, then he diars and you go down, you tech it, end of combo. if thats not how it works, just post specific stuff that falcos do to you, but yeah, if you just hold away from the falco when getting shined you should be fine.