There are some people like bry and me and rob and jesse, that will want to get good at smash no matter what you do. I started playing melee with goodies in 06 and he consistently 4 stocked me with minimal effort. He even4 stocked me with game and watch using nothing but wavedash backwards, to wavedash forwards fair. Thats what made me pick up Gwatch and why its so **** now.
Jesse had a similar story, he used to talk maddddd junk about how amazing he was, only to get repeatedly obliterated by goodies, and pikapika, and rick and amanda and PJ (the last 3 being old melee players that dont come to tourneys anymore) and that inspired him to get better.
but the majority of people arent like that. most players that have their first encounter with the competitive scene of a video game, wont continue to play the game if they dont believe that they themselves can achieve the level necessary to beat the people that they play with.
because of that, normally if you are way better and playing with somebody who one of those best-on-my-block types, you dont want to just destroy them. That will just immasculate them and disuade them from playing further. and then they wont want to play with you anymore regardless of how much potential they may have. if you are going to beat them, you want to beat them by a small enough margin that will make them think that they can eventually get good enough to beat you. if possible also do one or two things that theyve never seen before. because that will give them a reason to get better at the game.
You can than give them small tips and inch them along the path of getting better, until they come to you and ask you how to really get good.
its a very delicate process, because if you ever make it so that its not fun for them anymore, theyll stop playing.