the only advice i can give you is to gather the 'un-diverse' ones that are all over the place then collate them into one that suits you. that's what i have done and i have most of the graphics from both games. so good luck and get to work.
sorry, but the pokemon essentials starter kit is for RPG Maker XP. 2003 doesn't have the scripting capabilities that allow XP to be able to make and play Pokemon games. I suggest you get RPG Maker XP and start from there. XP is better than 2003 anyway.
Now what did posting a new thread for a post you did a while ago get you to, cause that was pretty much pointless for doing so :/ What's confusing is how you are asking here for ROM-hacking resources in a game development area. http://www.pokecommunity.com/showthread.php?t=116370 Try re-downloading it and seeing if it's within their. Sorry if this sounded harsh or obnoxious in anyway.
Considering that fact that the games are still a recent release, I think you'll have to wait a while for someone to patiently rip the tiles through screenshots, then manually edit them so that they no longer have the 3D perspective and appear as proper 2D representations of the 3D models that the HG/SS maps are built on.
I've been lurking around the forum for a while now, checking out each thread here in the resource forum to see if I could find what I was looking for, but had no luck with it so I'm going to put down a request.
I noticed that Rm2k3Kid has an expansive collection of 4th Gen overworld sprites in the form of charsets for Rpg Maker XP. I also noticed that somewhere, someone mentioned that he converted these leading me to believe that they were first made in the form that Rpg Maker 2003 recognizes as there are programs that convert 2k3 to XP.
I can go and complie RM2k3 sets myself, but if the work has already been done and they exist somewhere out there, I could spend that time on actual game development and the custom sprite that are needed.
Im looking for team magma the gym leaders and the elite 4 (excluding steven), Ive managed to make team aqua overworlds, but Ive looked everywhere and kyledoves is the only one ive found and its incomplete. thanks in advance for the help.