Next question, can you kill the script that makes you spawn in a truck/ makes the truck sound/screen shaking? It makes no sense for my story.
There is a specific thread for this in the main Rom Hacking section. We also have a program called DNS which inserts an RTC into any rom, so RSE's clocks are useless.
There are several ways. The easiest is a program called "Truck Remover". It is slightly buggy on Emerald, but give it a try.