Wanna see a giga Jigglypuff?
It's enormous, taking up the whole level.
How to do:
You need to be on the Bridge of Eldin
Smash Balls must be enabled
You must play as Jigglypuff
Using Jigglypuff, get the Smash Ball and wait for the bridge to break for the bomb that one of the weird creatures throws out. When the spaceship comes out, jump to the center of where the bridge was and use her Final Smash. Jigglypuff will get big, but she won't get small again. So now you have a giga Jigglypuff.
Using this video, though, will make it much easier.