ARGH! I cannot face Dark bowser.... I swallowed Fawful or whatever that is and I can't beat that! I battled every single monster in the game! I CANNOT BEAT HIM! I NEED ADVICE such as what to use for SP and stuff....
Maybe you're underleveled... Try to grind some more and use the best SP skill you have... For me, I beat fawful using the star throw SP skill... along with lots of recoveries and half SP equipment for Luigi...
Um.... I kinda suck at star attack.... and I think I need to grind.... to level 40...... But I still suck (unless I use cheats! Teehee!)