Here's the thing I'm having trouble with ROMs I don't know how to delete the saved games of certain ROMs for example Pokémon Platinum how do you delete the save file I'm older Android device that does not support multi touch with more than two fingers? Android version Jellybean.
If you were to not load a save state, you would be on the platinum loading screen, yes? If you want to delete it to start a new file, simply press new game and use the game's built in save feature to overwrite your current one.
Should you want to entirely remove your game, you would want to go into your phone's file browser and delete it manually. Hope this helps!