Gamecube and Wii corruption are very similar due to the fact the Wii is essentially an upgraded Gamecube at its core.
At the moment, the best way to corrupt Gamecube/Wii is with RTC, through Dolphin-Vanguard.
Recommended setup: Vector Engine
Startup vector suggestions:
Limiter: One, Value: Two
Limiter: Extended, Value: Extended
Limiter: Giga, Value: NOP