system
Given the following post, respond as if you're commenting on Reddit:
human
[Smash Bros.] How do all the fighters know how to create an Energy Shield?

Hi, I'm a Koopa, and I won some front seat tickets to the Multiversal Battle Tournament from a radio promotion to watch His Majesty King Bowser compete against other fighters from many different worlds. 

During the first match, his Highness reared back to breath fire on some giant electrified yellow rat. However, the rat seemed to make a defensive posture and a blue bubble formed around it, shielding it from the flames. (Some human kid with a red hat in the row behind was shouting the rat's name, apparently it's called Peekachoo?)

I thought that it was one of the rat's special powers, but no, later on, the green-clad knight did it too, but his was yellow. Then the really tall dude in the orange armor with a cannon-hand created a green bubble to defend against one of the rat's lightning bolts (Wait no, she wasn't a dude, she was a girl. I remember because she took off the armor to fight in another match for some reason...). And THEN, his Highness blocked one of cannon-arm's missiles with a red bubble of his own! 

As I kept watching the fights, I realized that EVERY fighter could make a shield-bubble. Even Princess Peach! (Who, by the way, made his Highness look like a chump in that last match. Why does she need Mario's help all the time? That's a question for another day I guess...) 

How is this possible? Is this some kind of special ability that all fighters who compete here need to learn? Can I learn how to do it? It would certainly be more effective than hiding in my shell, all Mario needs to do is jump on me and flip me over. 

(Actually, now that I think about it, Yoshi couldn't make one either, he just hid in an egg. Is there some special reason Yoshi can't make a bubble?)
gpt
Smash bros. is the manifestation of a child's imagination while playing with his action figures. So whatever the kid wants goes.

Also, the addition of bayonetta into smash is clearly the result of the child hitting puberty.