I understand doing only two tires at a time. They call it "straight rotation" at the following website:
https://www.bridgestoneamericas.com...bility/safety/maintaining-tires/tire-rotation
It states that it's an older method, or the method needed for directional tires. And of course, one can choose this method if, say, they only have two jack stands like
@bigred90gt has. Or if they just want to do it that way for no particular reason. However, I think a lot of people, myself included, prefer the X-style rotation shown here:
Note that if you follow a single tire through four rotations of the X-pattern, it takes a turn on each hub and returns to its starting point. I feel this gives best wear evenness, and it's how I prefer to rotate my own tires. I think a lot of others like it too.
But the point is, you cannot follow the X-style pattern without raising all four tires off of the ground. That's what the others are talking about.