There is no weakness

Im a falcon main, my best match ups are all be characters (bowser DK DDD) Mario (if you know the matchup) Samus, more or less any character who isn't very combo heavy since falcon is a fast faller and gets destroyed with combos. Bad match ups are all the top tiers, Kirby, Lucas, Ness, LUIGI (probably the worse matchup imo) toon link, etc. Falcon is punishable and it's all knowledge on the matchup eventually, if a falcon can't DI he won't be out of those u tilt combos till 49 percent overall.