Here’s a concise post you can use:
Configuring a Classic Controller Dolphin Emulator is essential for playing Wii titles like Super Smash Bros. Brawl Mario Kart Wii
Open Settings: Click the Controllers button in the Dolphin main window.
Downloading the Classic Controller Configuration
Problem: "The config doesn't show up in the profile list."
Button Mapping for Classic Controller
Wii Remote 1: Select Emulated Wii Remote from the dropdown and click Configure.
Are you using an original Wii Classic Controller or a standard PC gamepad (like Xbox/PS5)?
Save the file, reload the profile in Dolphin, and you have now created a custom "top 1%" config.