So I'm having troubles getting multiplayer to work between my DSi and DS Lite. I've tried it with 2 physical games and via sd download play. Have also tried to initiate the game from both consoles.
Step A, Boot a game, select multiplayer, select host a game.
Step B, Boot the other DS in Dowload Play and join, or
Step C, Boot other game, select multiplayer, select join a game.
If that doesn't work, then one of your ds units may have a defect. Can they both connect online?