Zakyrus was doing the YouTube tutorials.
While you can change the startup location by enabling File -> Patches -> Startup Location, I prefer to keep location 0 as the startup location and changing things from there.
If you go to Window -> Locations and click on Events for Location {000} Load Screen, you'll see the code for the load screen's events.
Everything is done in one object on this one. The labels in brackets, [xxxx], are hex offsets in the event packet. You can change these, but they won't save.
At [00E3] is a ChangeLocation to Location {1F0}, the present overworld. This is where the intro cutscene begins.