If you set the DS to "Auto" in the settings, take out the battery, wait a while, put the battery back in, it should take you to the initial setup. Go through it, setting everything up. Once the DS says "The system will now shut down", use the power switch instead of pressing A. Now the DS will automatically skip the Health and Safety screen on EVERY GAME. The downside to this is that booting without a game takes you back to the initial setup, and completing the setup normally will result in disabling the trick.