Like most unlockable parts, you will have to get sufficient coins to unlock it. However, these unlocks are completely random so there is no specific amount of coins needed to unlock the B Dasher.
If you need to unlock her in Mario kart wii here is the answer: Win the 150cc Special Cup. If you need to unlock her in Mario Kart 7 here is the answer: Win the 150cc Mushroom Cup. Source: I beat Mario Kart Wii, and I unlock Daisy in Mario Kart 7.
yes
You will unlock it randomly i think
No Rosalina doesn't. But the stars are like her kids... kinda
there are no cheats
i don't know and get a life
1800 coins
You can't, he's not in Mario Kart DS. However, you can get him in Mario Kart Wii, Mario Kart 7, and Mario Kart 8, and Mario Kart 8 Deluxe.
Beat the Shell Cup on 150cc
Yes, you can. You can unlock him by getting first on the special cup 150cc.
No. I also wanted to unlock him in these games,too
get gold in 150cc lighting cup