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Rob is not in Mario Kart Wii.
You have to unlock one expert staff ghost in time trials
Complete the first stages
Simple, you don't, you unlock baby daisy.
You have to unlock 8 expert staff ghost data to unlock him
Sorry, I dont think giga bowser is a character in Mario Kart Wii.
by getting good times on each track.
Complete the Mushroom and Flower Cup.
Play 16 time trial races.
You can unlock King Boo by playing the Time Trial for the Ghost Raceway.
go online and look for Mario cart character/game cheats
you just get in first unlock trophes get star rankings and have fun