Set this to 3x Native (1080p) or 4x Native if you have a dedicated GPU. This removes the jagged edges from the Pokémon models. Linear Filtering: Keep this enabled to smooth out textures.
Popular mods, such as Rising Ruby or Star Sapphire, often require the base game to be updated to 1.4 to avoid crashes. How to Install the 1.4 Update on Citra Pokemon Omega Ruby 1.4 Citra
Navigate to your Pokémon Omega Ruby v1.4 update file and click open. Set this to 3x Native (1080p) or 4x