Side+b Everywhere and laser spam! It works trust me.

*Looks at Tommy G*
But Ive got something for him now, its called....
Ledgecamping.
It's just a really bad match up for Dedede. Falco can shield poke if his aerials are spaced and his moves are faster than the majority of Dedede's. If you just keep an attack going and maintain good positioning, you should be able to win this one easily. If they up tilt your phantasm, you're getting way too predictable.
I didn't side B and laser spam you....trust me, it could have been a lot worse. Ask anyone I use to play/ watch my old videos.
I use Side B a lot to move horizontally. Falco's run is horrible. I've learned to cancel it where I want to either stop and jab, hit inside of you to possibly shield poke and combo set up, go through you for a safe move, or shorten it for the mind game.
I'm a little unorthodox with dealing with ledge camping, you'll have to see when you try it
