How do you get Gaara in don battle stadium

its easy but very annoying at the same time. simply go to story mode and beat it, doesn't matter what difficultly it is, make sure to do some mission in story mode for this to work right. after you beat it there should be a slot machine challenge. try and get 3 jump pirates after that you will try and get 3 golden question marks, not that this will not always be a character. yes you will not get lucky about 70% of the time.