This is the most critical question. The Dolphin emulator itself is perfectly legal. It is a piece of software that contains no copyrighted Nintendo code.
The most bizarre party game ever made. Dolphin handles the micro-game transitions perfectly. If you have a Bluetooth adapter, connecting five real Wii Remotes for local multiplayer works flawlessly.
These titles are verified to run exceptionally well, often benefiting from upscaling to 1080p or 4K. Super Mario Galaxy 2