You have to get at least a one-star rating on all the 150CC Retro Grand Prix cups
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The fastest kart in Mario kart wii is the Jetsetter.
Win all of the 150cc Retro Grand Prix cups with a 1 star rank or better.
Wiggler is not unlockable in Mario Kart Wii.
If you need to unlock her in Mario kart wii here is the answer: Win the 150cc Special Cup. If you need to unlock her in Mario Kart 7 here is the answer: Win the 150cc Mushroom Cup. Source: I beat Mario Kart Wii, and I unlock Daisy in Mario Kart 7.
There is no 300cc cup on Mario Kart Wii.