Ok.... i will join your team i have a good knoledge of gold since i played a remake...
Ok first close up the real rt 29 on all directions.
2- Use the same tile in New bark and dig out a path.
3-Start the map and name it RT 29.
4- The fun part, add the events (people, signposts, etc)
5- insert the map.
6-Make the connection ( since its south in new bark, north and left and north is new ark town
and.... add wild pokemon
VOILA!!