: Tileset images must be exactly 8 tiles wide (256 pixels total).
While there is no single academic paper dedicated solely to "Pokémon Essentials Gen 4 tilesets," you can find comprehensive technical documentation and community-curated "resource papers" (guides) that explain their implementation. pokemon essentials gen 4 tileset
Once your graphic is in the Graphics/Tilesets folder, you must configure its behavior in the Database (F9): : Tileset images must be exactly 8 tiles