Hey there seems to be a bug. When I finally made it to the elite 4, I didn't have to battle the second and third member. When I talked to them, they gave me post battle dialogue. I did have to fight lane and the rival though.
I also went through the dialogue with oak after, I accidentally skipped one frame of text that I think said something about teleporter, my bad on that, and I can't get him to tell me about a switch. I'm not sure where the switch is in old vermillion, but I assume it's the little green square in the walkthrough near the two cut bushes. I think there may have been a mistake on that page though because it also talks about finding mew under a truck that doesn't exist there and you can't enter the port. I have more than the mentioned 60 pokemon requirement at 117 Kanto and 277 national owned pokemon
There is a mistake on that page of the walkthrough saying you can't get to the upper part without surf, but there's a jump point next to the icon of the the scientist guy. Who I also don't have in my game?
I tried to patch it with the ips on the first page to make sure I had the most recent version but it didn't help. The files on your drive say they were last edited on march 3rd so wouldhave that already but I tried that before the one in page one.
The guy blocking the entrance next to the league says I need to beat the elite four and achieve a great accomplishment, what is that accomplishment?