Connections are really simple actually.
you just find the adjustment, map bank, and map number and redirect it to another direction.
For example you could make viridian city go to vermillion city instead of the pokemon league if you have the adjustment, map bank, and map number of route 11.
If you want i can even give you all the connection numbers of every place in there.
the number of zero's may work, but i've never actually had to use it before unless it included making a new connection instead of replacing one.
i hope thats simple enough for you.