It would be hard to find a bowl today that does not have a 2" or smaller outlet on the bowl.
Plungers have either a 2" end, or the black rubber plungers have a 2" pullout on the end.
Either way, with any brand of toilet, you would leave a little water in the bowl, and use the small end of the plunger in the bowl.
Using small strokes up and down, basically vibrating the water, then slightly pulling up a bit.
Normally the water will suck down at that point.
Many of the better toilets would rarely need plunging, and the Drake is very good. If they do need plunging, its just like the rest, it still uses a plunger sold in any hardware store.
This is the best plunger to use. It is soft rubber with a pull out small end. It's a "one" hand operation.