Where is the usc station

This is from the FlixBus bus stop locator in the FlixBus App. Look first Los Angeles then USC. It reads "Bus will board on the curbside of S . Hope Street directly south of the USC Campus shuttle bus loading zone adjacent to the Grand Avenue Parking Structure (formerly UPX). Passengers may wait for the bus at the covered campus shuttle waiting area but the bus will only board on S . Hope St. The address of the Grand Avenue Parking Structure is 3401 S Grand Ave, Los Angeles, CA 90007"

So the bus for usc stops at the parking lot, kiddy corner from union station.

You would need to take the train.