i am not reallysure, but if you get a star rank in all the retro 100cc cups, you unlock Bowser Jr.
win the 100cc mushroom cup and flower cup
Mii outfit A - win 100cc special cup Dry Bones - win 100cc leaf cup Bowser Jr. - Attain at least 1 Star Rank for all 100cc Retro Grand Prix Cups
You have to win the Flower Cup on 50cc, 100cc, or 150cc. (If you beat Flower Cup on 50cc, it will not appear on 100cc or 150cc, etc.)
You Get a One Star rank or better in all 100cc Retro Cups. or win 3,450 races.
Win all 100cc retro grand prix cups and get a 1 or more star rank!
get at least a one star rank in all 100cc retro cups
Beat 100cc retro cups with 1 star or better.
defeat 100cc star cup which also unlocks 100cc special-beat to get mii outfit a
Just keep playing the grand prix until you unlock something. I've memorized a few unlocking formulas, so here they are:To unlock the Star Cup: Get at least 3rd place or betterin the Mushroom and Flower Cup.To unlock Dry Bones: Unlock the 100cc Leaf Cup.To unlock Daisy: Win the 150cc Special Cup. (Win the Star Cup 150cc to win the Special Cup 150cc)To unlock the Leaf Cup: Win the 100cc Banana Cup.To unlock the Lightning Cup: Win the 100cc Leaf Cup.That's all I know for now. I hope this answered your question! :)
Win the Leaf Cup on 50cc to unlock the Turbo Blooper kart. Win the Lightning Cup on 100cc to unlock the Zip Zip bike. Win the Leaf Cup on 150cc to unlock the Royal Racer kart. Get a 1-star rank on all 100cc Grand Prix Cups to unlock the Sneakster bike.
The unlockable bikes on Mario Kart Wii are:Small Bikes- Quacker, Magikruiser, Jet BubbleMedium Bikes- Zip Zip, Sneakster, Dolphin DasherLarge Bikes- Shooting Star, Spear, PhantomHow to unlock them:Quacker- Win the 150cc Star CupMagikruiser- Play Time Trial Mode on any 8 coursesJet Bubble- Win the *Mirror Leaf CupZip Zip- Win the 100cc Lightning CupSneakster- Earn at least 1 star in each 100cc Wii Grand Prix CupsDolphin Dasher- Win the *Mirror Star CupShooting Star-Win the 100cc Star CupSpear-Unlock 12 Fast Staff Ghosts in Time Trial ModePhantom-Win every *Mirror Cup in the game*To Unlock Mirror Mode, win every 150cc Cup in the game*
you play the star cup 100cc and finish in the top 5 for points