Platforms like Boosteroid or Xbox Cloud Gaming allow you to stream the game directly to your device.
Titles like The Simpsons: Hit & Run or True Crime: Streets of LA are excellent open-world alternatives available natively for the Nintendo GameCube and work flawlessly on Dolphin.
Dolphin is designed specifically to play and Wii games [3]. Since GTA V was built for much more powerful hardware like the PS3, Xbox 360, and PCs, the Dolphin emulator simply doesn't have the architecture to recognize or run a GTA V ISO [3, 4].
An excellent open-world empire-building game based on the movie, optimized for Wii controls.
What are you trying to play on? (PC, Android phone, etc.) What are your device's hardware specs ?