Mario Party 9

Doing story mode, at Bowser station, Magikoopa literally was the only one who hit Bowser Jr. In all 3 games, every time I'm about to get to the end with any sort of lead, something hits a bowser spot for battle for half of the mini stars, which a computer wins by picking one of the pure luck games. I'm at a loss.

It's rubberbanded. That happens because they're losing at that moment.
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Lover of all things cute and pretty. <3

It's rubberbanded for everyone. I played a few rounds with friends (speak: human players).
When one of us was on fourth, everything that happened worked in their favour.
While the first placed always gets punished for being, well, first.

I have never heard of a rubberbanded Mario Party before. Besides, this game Is already centered around the luck of the die.
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I'm gonna go out on a limb here and say that a tomato is a mineral.

Rubberbanding + Mario Party was a terrible, terrible idea. >_>
It would be good as a HANDICAP, maybe, to keep bad players from falling too far behind as easily, but that's it.
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"The best things in life must be taken by force!"
~Captain Khan

Sorry, but what is "rubberbanding"?

But whenever I play, during story mode it's usually Kamek/Shy Guy that win.

Rubberbanding is when the AI makes more or less mistakes to keep relatively close to you, to give the illusion of a competitive AI. It's called Rubber Banding because the further ahead of or behind you they are, the more it forces them back to the middle, like pulling a rubber band.

From what I've been reading here, it seems like the whole game rubber bands, whether you're a player or an AI, trying its hardest to prevent someone from being in first for a long period of time.
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"The best things in life must be taken by force!"
~Captain Khan