Who Needs It?
As you probably know, a type rating is required for any large airplane (over 12,500 pounds) and for any turbojet airplane regardless of its weight. Almost always, the type-rated pilot needs an instrument rating too. There are exceptions, such as the Ford Tri-Motor, for which a pilot can get a VFR type rating. While weight is defining on the top end, at the lower end it's not. Even though the Eclipse 500 weighs just 6,000 pounds, a pilot needs a type rating for it. That means passing a check ride, which in many airplanes can be done right in the Level-C or Level-D simulator. One can, of course, train in an actual airplane. In some cases, that might be the only option. In other cases, pilots who already own the airplane will sometimes choose to train exclusively in it. I'd recommend against that, though, simply because there are too many things you can do in a sim, like a dual-engine failure on climb-out — that you probably don't want to try in the real airplane.