Seriously how does Mario obtain the power of shooting fireballs. Does Mario just put it in his pocket and shoot? Does he eat it? Or does he just hold the flower in his hand?

lol, who knows, I have no clue, just think of it this way, it's Mario, lol.

I have no idea.

I really don't know i think he eats it.......wait then it would come out of his mouth..........hmmm. well mario's an awesome magical plumber, can't beat that! :)

It's what I call Mario PHYSICS.

everything is something he eats, and it then warps his sense of reality.  all he is doing is walking around in the real world while tripping balls and believing that he is seeing these weird gumbas and stuff.  also, that is why he can jump 3 times his own height

Now that we're at it, how the hell does his clothing colour change?

Two years ago.  TWO fucking years ago!  Gaaaaah! 
 
Super Smash Bros. confirms that he holds the flower.  But it turns invisible once he picks it up.  His suit also changes color because of the chemicals that the flowers release.

There's actually a reason? Wow. Here I was thinking this would be a joke thread.
So how comes the fire flowers in brawl don't disapear when they are picked up? And how comes Mario can do fireballs in Brawl without his costume changing?

Ok yeah fair enough.