For me the falcon approach is a whole lot of mind games. Shield cancelling dashs and rolling, at least trying my best to bait out an attack from the opponent because of falcon's amazing ability to punish once you can land a grab or dash attack. beyond that, short hop + Nair (only the first hit) + Jab combo is a good one. If you only land the first hit of the Nair then the hit stun will be enough for you to immediately land and get into a jab combo. That being said most good players will just throw up their shield once you're in the air, so use this sparringly. A good way i find to bait out attacks is short hopping right near the opponent than trying to use your second jump right as he tries to punish and hit him with the back air on the way down. But yeah, he's not the best at approaching, dash attack or dash grab are the best options, but keep in mind how fast falcon is and that he's a fast faller because it can make it easy to bait out attacks/dodges.