So basically, I got SSB for Wii U as an early Christmas gift, and so I played the living snot out of it. I was doing the challenge, "A battle of scale" and I was having trouble. If you don't know what the challenge is, it's that you have to beat giant Bowser as Olimar on the Garden of Hope Stage.
So at one point, I kinda started fooling around, and I was trying to get in the pot when the Pikmin rebuild it. So I did a few times, but once, Bowser got in with me! Since we was big, instead of his body sticking out of the pot, he kind of just disappeared, and when we broke the pot open, he was normal size permanently!
It also made the event much, much easier.