I would love to insert a more diverse collection of rocks and trees, but I just can't insert any tiles properly, I always screw up my whole ROM some how. :( I also prefer Firered over Ruby in general, but I really like the Dewford town tree, the Emerald grass, the Ruby basic path and the large tree in my map. I guess I'll try again to insert them into Firered.
The bottom right mountain, is my bad, I used the wrong tile by mistake and no the back of the gym isn't supposed to be accessible, I just got lazy, I'll fix that up right away. I really like your map by the way :) I can see a few tile errors, but you were going for some Nintendo style, right?
Anyway, thanks a lot