So the map is in the game, and the first few times I tested it, it worked completely fine, as in, I could still warp back to the League Gate, but since I've changed the music for the area multiple times; (because even though its an English ROM, for some reason all of the music titles are in French, AND they're not the correct titles for the songs...) The warp has stopped working.
I guess with this problem I'll use one of my back-up roms.
Oh yeah, and I couldn't make a new title for the map, instead it changed Pallet Towns name into Route 28, and there's no pop up for the actual route.
Besides that the area and wild pokemon work fine.