Now, i can do this, but its hard, i use the classic controller, and i don't think you can
do this cheat on regular wii remote/nunchuk unless you change the taunts to the d-pad. now
it took me a couple tries to figure out what to do, but if your a beginner, you should go
on practice. pick samus and whatever cpu u want, and go to whatever stage (i recommend
final destination). once the battle starts, puase it and make the speed to 1/4 speed,
unpause it and start pressing the up taunt and down taunt really fast and if u do it
right, you will turn into ZSS... now if you wanna know how to do it without turning the
speed down, what i do is i start by pressing the up taunt, and then i start presssing the
up taunt and down taunt TOGETHER really fast, and if you do it correctly, you will turn
into ZSS..... Now, there is a way to switch from ZSS to Samus. I am trying to figure out
how to do that... if i figure it out, i will post it...
Hope this helped- :D   -Lightning110