I understand that doing this in offline matches, most people would catch you, but do you have any tips on doing this? I have seen this like once before and it didn't make sense to me (Because I was a Low Tier Link main) and now that I wish to become a Falco main, do you guys have any tips on being able to do this?
I understand the idea of doing this, but do you guys have any ideas how to do this consistently?
It takes a little practice. Just head into training mode and practice wall jumping against the base of the stage.
Personally, I prefer practicing on stages that have diagonal bases like Final Destination and Battlefield, but it's nice to know how to do this on every stage.
A good tip on the wall jump itself would be to start by grabbing the ledge > fall > jump into base of stage > move directional stick in the opposite direction > Up B or Side B to get back to the stage.
Keep in mind that you have to be in contact with the stage BEFORE you move the directional stick in the opposite direction. You'll know the exact moment when you hit the base when your Falco's horizontal momentum has a noticeable change. It's best not to get too itchy with the directional stick before that moment, because if you try it too soon, you won't even make contact with the base of the stage.
On the (hopefully) rare occasion you miss, you'll be able to know soon enough to use your Up B to recover.
Hope that helps.