All you have to do is to beat the Lightning Cup in Mirror Mode. To unlock Mirror Mode you have to beat all the 150cc cups.
the blue falcon is the ansewer
First, you have to unlock the Mirror Mode of the Mario Kart game by winning all the 150cc cups with gold. Then, you have to unlock the Lightning Cup. By unlocking and winning the Mirror Lightning Cup in Gold, you can unlock the Blue Falcon. It's good you asked, because the Blue Falcon is an amazing kart. It is very fast. (Just try not to go offroad with it)
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.
1800 coins
there is no goomba to unlock in Mario kart wii
You can't unlock Pauline in Mario Kart Wii,he isn't in that game.
there is no baby rosalina in Mario kart.
You cannot unlock Baby Mario in Mario Kart DS. He is only in Mario kart: Double Dash!!! and Mario Kart Wii.
Wiggler is not unlockable in Mario Kart Wii.
There is no diddy kong in Mario kart
You can't unlock Bowser Jr on Mario Kart DS.
On Mario Kart Wii unlock all the cups and do all the time trials. You'll get Toadette. And Mario Kart DS? I have no idea why this is, but you can't get her! Good luck!