It's hard to get a wavedash feel on characters like Falco, Link, and Mewtwo for some reason. Well, Link isn't so hard, really, since he's my favorite and I've made it work (GERM's videos are quite the inspiration). As for M2 and Falco.... Falco is just awkward for no good reason and M2 turns invisible when I screw one up, and that just throws me off.
Oh, and DK and Bowser seem too large to wavedash usefully..... the most they could probably do is slide to grab edges and MAYBE evade an incoming aireal, which would probably be better off SG'd anyway.