I never played it
You have to beat one of the star roads located to the right on the star cup
reply star cup
Go to the star cup after you win it ad you get the star road and it is hard
beat the star cup
You have to do the Flower Cup, and the Mushroom Cup.
50cc star cup
You unlock star cup by by winning any cup in the flower cup in the respective class you want to unlock.
Get the star cup in 50cc and get first place. You have to get star or more in mushroom and flower cup.
Complete the Mushroom and Flower Cup.
The Mushroom, Flower, Star, or Special Cup.
To unlock Dry Bowser in Mario Kart Wii, you must win the 150cc Mushroom Cup, Flower Cup, Star Cup, and Special Cup with a ranking of at least one star on each.
You don't get any character for beating that cup. You do, however, get the Twinkle Star bike.