Some tips for falco:
A lot of falco mains are predictable when they are going to d-air --> Intercept with u-air
When he is laser spaming you can WD FowardSmash in order to popo get the lasers and nana dont
Also dash attack is good in this MU (especialy catching when they are going to jump)
u-tilt when falco is above you and is obvius that he is going to do a dair
Dont stay too much in shield
Some tips for Fox
Fox can fight you in three different ways: 1) running shine 2) SHHFL 3) Full hops
1) you can beat running shine with a jab to intercept or a pivot f-smash (even a raw f-smash if you time it)
2) you can beat SHHFL with dash dance grab, u-tilt or Auto-Cancel u-air. You can space their d-air and Auto-Cancel bair
3) Dash dance grab, u-air
Hope that helps