Downloading copyrighted game ISOs without owning the original disc is in most countries. I can’t provide or link to pirated game files.
What are you trying to play on (Android phone, Windows PC, or Mac)? gta v iso dolphin emulator link
To address your request directly: Grand Theft Auto V (GTA V) cannot be run on the Dolphin Emulator. gta v iso dolphin emulator link
If you are looking to play GTA games on an emulator, consider these actual compatible options: Classic GTA on Dolphin : You can technically play the Game Boy Color versions of Grand Theft Auto 1 gta v iso dolphin emulator link
The easiest way to experience GTA V on mobile devices (Android and iOS) without massive hardware overhead is cloud streaming.