Paper Mario: The Thousand-Year Door Cheats

Shadow Queen winnings
the following things become available after you beat the shadow queen.

You get the last three troubles
These two ghost people apear in front of Poshley Sanctum
Super Luigi becomes available in shop for (I think) 264 Coins
you find out what the treasure is from Frankly
everyone coomemorates you for beating the demon, accept a few people think that you are lying
You get one star point(Riiiip OOOOOOOff)

I think that there might be more but I dont know.