Beat the game with all five characters and I think it's on the main screen.

Before turning on your nintendo ds,insert the gamboy advance game:Kirby Nightmare in Dreamland,Then turn on your ds and start Kirby Canvas Curse.Load a file of your choice and a message should appear saying "You can now use Waddle Dee ball!".This won't make you pay any medle's.And though you can't copy abilities you will always have beam ability.I don't know if you have to beat Drawcia,Because I discovered this after beating the game.