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! :)
look on your wii
to unlock any expert staff ghosts in Mario Kart Wii, you gotta beat the normal ghost in the time trials.
beat the normal staff by about seven seconds
You have to unlock 32 expert staff time trial ghosts.
Beat 8 expert staff ghosts or beat normal staff ghosts by 3 seconds a minute
Unlock 8 expert staff ghosts in Time Trials mode.
you have to get 7 seconds before the Nintendo ghost data
You have to unlock four expert staff ghosts in Time Trials.
beat the regular ghost by 7 seconds or more
Get all expert staff ghosts and Mii Outfit B will be unlocked.
If you meant fast staff ghosts, go to cheatcc.com to check how.
To earn funky kong in mario kart wii you unlock four expert staff ghosts.