Mario Power Tennis Unlockable Artist on the Court
Complete the indicated paintings within time limit. Yoshi%u2019s painting: Complete Bowers and Bowser Jr.%u2019s painting
Luigi Painting: Complete Mario%u2019s painting
Diddy Kong%u2019s painting: Complete Luigi%u2019s painting
Bowser and Bower Jr.%u2019s painting: Complete Diddy Kong%u2019s painting

Mario Power Tennis Unlockable level
Super Panic level: Finish the Panic level.
Ultra-Hyper Panic level: Finish the Super Panic level.
Famished Chomp level: Finish Hungry Chomp level with the highest score.
Hungry Chomp level: Finish Perkish Chomp level with the highest score.
Coin Challenge level: Finish the Gold Rush level.
Gold Rush level: Finish the Jackpot level.
Jackpot level: Finish the Fever level.
Iron Frame level: Finish the Aluminium Frame level.
Titanium Frame level: Finish the Iron Frame level.
Tic-Tac-Glow Challenge: 75 points in the %u201CDazzle Shine%u201D level
Sparkle Shine level: 50 points in the %u201CGlimmer Shine%u201D level
Dazzle Shine level: 75 points in the %u201CSparke Shine%u201D level

Mario Power Tennis Unlockable Game Mode
Ace mode: Beat the Planet Cup tournaments in singles or doubles mode.
Balloon Panic mini-game: Beat the Flower Cup tournaments in singles mode.
Bowser court: Win 1st place the Special Cup Fire tournament in singles mode.
Characters with star: Beat all three Normal Cup tournaments with a character
Coin Collectors mini-game: Beat the Mushroom Cup tournaments in singles mode.
Fly Guy: Earn the Mushroom, Flower, and Star Cup in singles mode.
Mario Bros. court: Beat the Special Cup Lightning tournament in doubles mode.
Mecha Bowser Mayhem mini-game: Beat the Mushroom Cup tournaments in singles mode.
Moonlight Cup: Beat all the Rainbow Cup tournaments.
Paratroopa: Beat all 3 Normal Cup tournaments in doubles mode.
Petey Piranha: Earn the Special Cup Fire and Lightning tournaments in doubles.
Shy Guy: Win 1st place on all three Normal Cup tournaments in singles mode.
Star Cup: Beat all 3 Normal Cup tournaments.
Unlimited Balloon Panic Challenge: Finish Ultra-Hyper Panic.
Unlimited Coin Collectors Challenge: Finish the Gold Rush Challenge.
Unlimited Gooper Blooper Volley Challenge: Finish Master Blooper.
Unlimited Terror Tennis Challenge: Finish Phrantic Phantoms.
Unlimited Tic-Tac-Glow Challenge: Finish the Dazzle Shine Challenge.
Wriggler: Earn the Special Cup Fire and Lightning tournaments in singles mode.

source article from : Mario Power Tennis Cheats GameCube