Here are the Resident Evil The Darkside Chronicles cheats for Wii listed in a nice overview. These include unlockable costumes, weapons, scenarios, chapters, difficulties and extra modes for this newest Resident Evil rail-shooter exclusively for Wii.

How to unlock Operation Javier Chapters 6 and 7
To unlock these last additional chapters, you must defeat the boss of Chapter 5 as quickly as possible. This will save a certain character you need to rescue and unlock the chapters. Read more