Polished Map++ is out:
https://github.com/Rangi42/polished-map/tree/plusplusIt's a map editor for pokecrystal projects that have expanded to 256 tiles and switched from palette_map.asm to attribute.bin files. Tutorials for that:
https://github.com/pret/pokecrystal/wiki/Expand-tilesets-from-192-to-255-tileshttps://github.com/pret/pokecrystal/wiki/Allow-tiles-to-have-different-attributes-in-different-blocks-(including-X-and-Y-flip)With this you can use at *least* 256 tiles, and tiles don't always have to be the same color. They can also be X or Y flipped like in Gen 3, so no need to waste tileset space on recolored or symmetrical tiles.
Red++ 4 and Coral already use this system, and Ancient Ruby is adding it soon.
More info:
https://hax.iimarckus.org/topic/7222/#p47768 