No, there is no cheat or code for the 150cc Class in Mario Grand Prix mode. You'll have to unlock it by obtaining gold trophies in all the cups on the 50cc and 100cc Classes. After all, practice makes perfect:)
Beat 150cc.
Just beat 50cc,100cc,150cc and 150cc MIRROR for R.O.B.
You complete all cups by being Mario on 50cc 100cc 150cc and 150cc mirror. Then you will unlock baby Mario
Beat 150cc Special Cup.
i don't remeber.but if you have the game beat 150cc answer this qustion.
yoshi
come first in all 150cc cups
Mariokart DS does not have a cheat menu.
It depends on who you use & your best courses
Get first place in most of the races.
Ill say Bowser JR on the Hurricane
The only way I know is to use a action replay ds