Successfully complete the indicated task to unlock the corresponding bonus:

Pikachu Hat: Successfully complete the Magma Colloseum.
Pikachu Wear: Successfully complete the Sunset Colloseum.
Crown, Flat 50, and Collosem Rule Changes: Successfully complete the Star View Colloseum.
Level 10 Pikachu with Surf Daimon and Pearl downloadable: Successfully complete all 10 Colloseums.
Pikachu Bag: Successfully complete Crystal Colloseum.
Pikachu Face Paint: Successfully complete Waterfall Colloseum.
Secret Gift for Pokemon Diamond or Pearl in Mystery Gift Shop: Defeat the Stargazer Colosseum Leader.
Electivire Outfit: Defeat the Crystal Colosseum Leader with Level 50 All Rule.
Groudon Outfit: Defeat the Magma Colosseum Leader with Level 50 All Rule.
Kyogre Outfit: Defeat Waterfall Colosseum Leader with Level 50 All Rule.
Lucario Outfit: Defeat the Sunset Colosseum Leader with Level 50 All Rule.
Pachirisu Outfit: Defeat the Main Street Colosseum Leader with Level 50 All Rule.
Roserade Outfit: Defeat the Neon Colosseum Leader with Level 50 All Rule.