How do you rescue Luigi and wario in Super Mario 64 DS?

You can't actually rescue Luigi and Wario in Super Mario 64 DS! They're not characters you need to save in the game.

Here's what you can do with them:

* Luigi: Luigi is a playable character in the game, and you can unlock him after collecting 15 stars. He plays like Mario but jumps a little higher and has a slight speed boost.

* Wario: Wario is also playable, but he's unlocked after collecting 30 stars. Wario has a much faster run speed and can use a special move called the "Wario Jump", which lets him jump higher and further.

So, instead of rescuing them, you actually unlock them as playable characters by collecting stars!