Keep playing!
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!
Win first place on the cups that you have already. They will unlock the next ones.
Get gold trophies in all cups.
come first in all 150cc cups
play through the game and get first in all cups
You beat all the mirror mode cups.
You can unlock him in both Mario Kart DS and Mario Kart Wii. To unlock him in both games: DS: Get gold trophies in all 50cc Retro Cups. Wii: Get a gold trophy on 100cc Leaf Cup.
You must beat some cups... then you play waluigi free
You can't unlock Bowser Jr on Mario Kart DS.
You cannot unlock Baby Mario in Mario Kart DS. He is only in Mario kart: Double Dash!!! and Mario Kart Wii.
You complete all cups by being Mario on 50cc 100cc 150cc and 150cc mirror. Then you will unlock baby Mario
you cant