If you're looking for a Wii game that uses a dance mat, there's exactly one: Dance Dance Revolution: Hottest Party 2 (2008).
It doesn't use a traditional soft dance pad. Instead, it's the only Wii DDR title officially designed for the Wii Balance Board, which functions as a rigid, pressure-sensitive dance platform.
It's a unique, somewhat niche experience—fun for balance training, but not the classic arcade pad feel. For traditional DDR on Wii, you'll need a GameCube DDR + soft pad + backward-compatible Wii (RVL-001).