Well, for a start, refer to the chaingrab sticky for % and followups.
Now... my input.
- Ftilt is safe on shield as always (well spaced, of course)
- Don't you dare IAP'ing when the other falco is doing a short hop, he'll most likely laser you, then you fall down, then you get RCO lag, then he punishes the hell out of you.
- I like to do retreating sh dairs, since they take falco out of phantasm and just seem safe.
- Dthrow at high % can be a stock if you get a good read.
- If you try to jab → grab, the other falco can gran you first, don't try to start a chaingrab with that.
-Sdi the dair after the chaingrab or you are dead, btw.
- Short hopping with an airdodge → utilt works wonders as an approach for me.