Welcome to PokéCommunity! Register now and join one of the best fan communities on the 'net to talk Pokémon and more! We are not affiliated with The Pokémon Company or Nintendo.
Yes, after patching the .ups patch into a clean rom you can rename your current .sav to match the name of the rom. If you need more help join the discord server, we have a channel dedicated to emulation/patching.
Are you sure you caught one wingull first? To get hidden abilities through dexnav you have to catch the Pokémon first, then the hidden ability will be available in the dexnav along with the mon's normal abilities.