Tilemap Studio was designed with the Pokémon disassembly projects in mind, but it works with any GB, SGB, GBC, GBA, NDS, or SNES files.
If you have extracted a tilemap from a ROM, and optionally a tileset image, Tilemap Studio can open them and edit the tilemap. It supports palettes and tile attributes like X/Y flip and priority, and has editing features like undo/redo, flood fill, replacing or swapping tiles, multi-tile selection, etc. It supports multiple tilemap formats, including GBC or GBA tile attributes, SGB borders, and some Pokémon-specific compression formats.
If you have drawn a mockup of how a screen should look, the Image to Tiles tool can also generate a tilemap, tileset, and palette. The tileset and palette will be optimized to fit in the platform hardware limits, taking advantage of X/Y flip if possible. If you choose to generate a palette, it can be output as an indexed palette of the tileset image, or as a separate palette file with a grayscale tileset.
More information is available in the Help menu or the GitHub page.
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