With a powerful enough computer, you can play games on the Wii and Gamecube using the Dolphin emulator. This is a great way to play games when you don't have a Wii, especially since games look much better than on consoles and you can play games up to 1080p (up to 1440p)!
Steps

Step 1. Make sure your computer is powerful enough to support the emulator
The recommended requirements for Dolphin are a 3GHz or higher dual-core processor and a graphics card that supports the latest DirectX or OpenGL versions. Recommended video cards are from ATI or NVIDIA. Integrated graphics (such as Intel HD series graphics) are not recommended. If you have a fairly powerful processor, but an integrated graphics card, you can still get decent emulator performance if you do the settings (see below). A 64-bit processor with a 64-bit operating system is also recommended for use, since they can direct more memory to the process and perform calculations much faster. Use the Windows operating system whenever possible, because the emulator runs faster on DirectX than OpenGL.
2 Install Homebrew on Wii, following the instructions in this article Wii discs are 4.7GB, dual Wii discs (for example, for Super Smash Bros. Brawl) are 7.9GB, and Gamecube discs are 1.4GB. Your device will need to be formatted for FAT32 or NTFS. You will need this program to make a copy of a Wii or Gamecube disc, which you will play on the Dolphin emulator. Extract the files from the archive and copy the applications folder to your SD card or USB stick. Start Homebrew Channel. You will see the CleanRip program listed in the list of options. Select it and click Launch. Select the device you want to burn the game disc to. Then indicate if your device has been formatted for FAT32 or NTFS. Press button A to continue. You can download them if you want, but they are optional and will only work if you have an Internet connection. If you haven't inserted it yet, do so. After inserting the disc, press Button A to continue. When you reset the game disc, the program will break it into several smaller pieces. Choose from 1GB, 2GB, 3GB, or full capacity. Please note that you can select the full volume only if your SD card or flash drive is formatted for NTFS, since FAT32 has a file size limit of up to 4GB. Also choose whether your disc is single-layer or double-layer, and whether you want the program to remind you of a new device every time it finishes processing a piece. The only known dual-layer disc on the Wii is Super Smash Bros. Brawl. When the game is recorded, press the B button to exit CleanRip and return to the Homebrew Channel. Remove your SD card or USB stick. Now you need to put all the pieces of the disc together to create a complete disc that will be read by the Dolphin emulator. If you made a full disc right away, then you can skip this step. Copy all pieces of the disc to your hard drive. Then open Command Prompt (if you have Windows) or Terminal (if you are a Mac or Linux user). Use the disc to get to where you copied the parts. After that, follow these commands to connect all the pieces. For Windows: copy / b.part *.iso.iso. For Mac or Linux: cat.part *.iso>.iso. It can be downloaded from this link: Go to Settings -> Folders and add the folder where the ISO file is located. Click "Update" and your ISO file should appear. You are now almost ready to play. All that remains is to set up the Wii Remote. This is where you can set up the Wii Remote. If you want to control your games with your keyboard, select Emulated Wiimote and click Settings to choose which keys will act as keys on the Wii Remote. If you want to use the Wii Remote to control the emulator, select Real Wiimote. Then connect your Wii Remote to your computer via Bluetooth. Then select "Connect". After that click "Update". The screen on the Wii Remote will show you what kind of player you are. You can now play! If your computer is not very good, you can try changing the settings to disable some of the features that load the processor and graphics card. Follow these instructions
Step 3. Find an SD card or USB stick large enough to hold the Wii or Gamecube disc
Step 4. Download CleanRip by following this link
Step 5. Insert your SD card or USB stick into the Wii console
Step 6. After the written disclaimer, the program will ask you if you want to burn the game disc to a USB stick or SD card
Step 7. When the program asks you to download the Redump.org DAT files, select “No”
Step 8. CleanRip will ask you to insert the Gamecube / Wii disc
Step 9. Select the desired size
Step 10. Wait for the game to finish recording
Step 11. Insert your SD card or USB flash drive into your computer
Step 12. Download Dolphin emulator
Step 13. Start the emulator
Step 14. Click on Wiimote in the upper right corner of the screen
Step 15. Start the game by double clicking on it
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