Use a tool like 7-Zip or WinRAR to extract the contents of ShadowSapphireB2d5Citra-pokemonerdotcom.rar .
You have a roughly 5% chance to encounter these variants in the wild. They typically feature a Dark or Ghost secondary typing and unique "shadow" moves like Shadow Sneak . ShadowSapphireB2d5Citra-pokemonerdotcom.rar
In Citra, go to Emulation > Configure > Graphics > Utility and check the box for Use Custom Textures . Use a tool like 7-Zip or WinRAR to
Open Citra, right-click on Pokémon Alpha Sapphire in your game list, and select Open Custom Texture Location . ShadowSapphireB2d5Citra-pokemonerdotcom.rar
