here is one i do often. I go face a level 9 computer in the "pit" section of hyrule temple (the spot where u can easily get to 300% damage and still live because of walls). I practice my wavedashing there, its extremely easy to practice teching, u can practice powershielding against weapons from some characters, and other characters, like marth, u might even be able to try to tech out of their throws since the throws have to hit u off the ground first. Obviously, i try not to be cheap by automatically wasting their repetitive attacking style. U can also try out all ur combos on them, as sometimes ur combos that u are simply trying to learn will hit. Plus powershielding can be useful in a junkload of battles. Especially samus dittos, lol.
Of course, i would get wasted by a good amount of the smash players out there, but thats simply because i never really get to play against humans (hence all the reaction timing training, and also the combo practice training).