Then you want a normal HGSS map, believe me. If you ever scale your game up to a larger size, I'll be happy to recreate it as a hi-res, but as it is, the added detail would be lost.
If you resize it, it will look much worse than if I make it for normal HGSS. I can remake the map as a normal HGSS just as easily. What size screen is your game run at? Default Essentials?