If you want to emulate, buy a used copy of Lego Batman 2: DC Super Heroes for Wii from eBay, a garage sale, or a retro game store (price range: $10–$20 USD). Once you own the physical disc, you can dump the ROM yourself using a homebrewed Wii and software like CleanRip . This is the most ethical and legal way to acquire your ROM.
Use the Dolphin Emulator with a real Wii Remote. Download your ROM from a reputable source that uses Redump DAT files (check the r/ROMs Megathread for safe links). If you enjoy the game, buy a used copy to support physical media preservation. lego batman 2 dc super heroes wii rom
Dolphin is the gold-standard Wii and GameCube emulator. Available for Windows, Linux, macOS, Android, and even the Xbox Series S|X (in Developer Mode). If you want to emulate, buy a used