Pistons get:

PF Zion Williamson

Pelicans get:

PF Tobias Harris

SF Ron Holland II

2027 DET FRP

2028 FRP Swap W/DET

2029 DET FRP

Why the Pistons do this:

They make a splash, adding a star to try and climb up the standings in the East.

Why the Pelicans do this:

Assuming they get Flagg, they get good value for Zion here.