To run classic video game console emulators You will need to unlock / jailbreak the Wii with a softmod or a mod chip amd install the Homebrew Channel. The emulators will reside in the HBC.
The Homebrew Channel is for sure, the king among all the other homebrew applications available today. This smart app (along with Twilight Hack) was developed by Team Twiizers and all homebrew applications can be easily launched using this application.
If you want to know more about Wii homebrew, read on.
The Homebrew Channel serves as a channel to easily launch Wii homebrew applications. It has a very beautiful little GUI which lists all homebrew applications stored on an USB mass storage device or SD card. You can also customize this GUI according to your requirements with shiny little icons and descriptions. Applications can also be launched via TCP or a USBGecko. Using these two built-in options, you can conveniently test out new codes and also a general purpose homebrew launcher.
micro-SDXC - Homebrew - Wii ISO
The Homebrew Browser is a very useful application through which you can directly download and update many Wii homebrew applications. The Homebrew browser lets you connect to a server through the Wii due to which you can easily and conveniently download and install homebrew applications. A very useful and necessary application.