There are plenty of emulators out there, but as far as GameCube Wii emulation goes, Dolphin is usually the way to go.. The emulator is constantly being polished to perform better and better, often resulting in tangible improvements in performance over the course of a few months. Now, Dolphin has detailed some of the biggest changes over the past few months, as the emulator turns 20 years old.
Source : Dolphin Emulator Gets Better Dark Mode, Performance Improvements