Gaming Mario Karts, help unlocking stuff?

[PettingZoo]

I'm unlocking some carts, bikes and characters in Mario Kart Wii and I am wondering what I have to do for playing a certain amount of time trials. Eg: To unlock Birdo you need to play 16 different Time Trial courses. I'm wondering if I have to win these or can I just lose on them?
Also it says I need to get at least a 1 star rank on the 100cc Mushroom Cup or have a saved game from Super Mario Galaxy to unlock Rosalina. I've got a 1 star rank on the 100cc Mushroom Cup and haven't unlocked her (Also I don't have Super Mario Galaxy).

EDIT: I know how to get Rosalina properly now

I got the information from cheatbrain.com

 

[Base]

How do you loose on a Time Trial? I guess your talking about the Nintendo Staff.

Anyway. You just gotta get a time, doesn't matter how slow you are. What I did was let my baby cousins play, since I couldn't be bothered.