Polished Map 1.7.0 has better support for pokecrystal's numbered tilesets. It shows the TILESET constant name along with the number (assuming that e.g. gfx/tilesets/18.png corresponds to the 18th const in constants/tilemap_constants.asm).
https://github.com/roukaour/polished-map/releases/tag/v1.7.0https://hax.iimarckus.org/post/46043/