Dark bowserby Thomas thorne I BEAT ThIS GAME!          OK   first use magikoopa mob 5 times to ko him. Than he will come back alive and get  huge. Than go to his belley and punch. Than dark fawful  will come out. Than inhale him.             When you fight dark fawful with Mario and luigi use snack basket three times than use falling star for the rest. Soon he will go 
back into dark  bowser.  Do it all again and the dark star core will be gone. Than press X super fast to finish him off.