From samthedigital again:
"With these sorts of glitch modes I think you can probably skip other major parts of the game, maybe even the guards on Victory Road. However, it still isn't a true warping technique (like dokokashira). "
"edit: I got around to reading some other parts of this thread just now. Apparently the hope of getting through this guard has been brought up before! Mr. Pwnage wrote:"
"I don't think Pokemon Tower can be skipped, because the guard at Silph blocks the way until you get through that (unless you can do something to make him disappear just as Snorlax does, or better yet do the same for the Saffron Gym guard)."
It doesn't work, he doesn't disapear. If you want to do any testing with the glitch to make Snorlax disapear, any effects are carried to the next route over only. It doesn't do anything to the route the glitch is used on. If you FCBM on Route 16 (where Snorlax is), then he doesn't disapear, but if you FCBM on the route beside him (east of Vermillion), then he will disapear.