They are done by the staff who created the program. A.K.A very difficult to beat.
You have to unlock 24 expert staff data's in Time Trials mode. (single player)
First, You have it since the day you First Played Mario Kart Wii. Second, it's a Kart, not a bike. If your still having trouble it's a Lightweight Kart, so you need to pick a character such as Baby Mario
look on your wii
to unlock any expert staff ghosts in Mario Kart Wii, you gotta beat the normal ghost in the time trials.
You have to beat the expert by 7 seconds.
You get Expert Ghost data when you beat the Standard Ghost Datas by a certain time. Some sources say by 6 or 7 seconds, but this all depends on the track size. You can unlock the Expert on Ghost Valley when you beat the Standard by 4 seconds, but on other tracks it is higher depending how long they are. Hope this helps! :)
You need to unlock 12 fast/expert ghosts.
Metal Mario Does Not Appeared in Mario Kart Wii, How Ever, He is a Playable on Mario Kart 7, 8, and Tour
you have to beat alot of expert ghost times
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.
You have to unlock 32 expert staff time trial ghosts.
You have to beat the first ghost's time