Wii is still my best local multiplayer console: Trauma Center series, Kirby's Epic Yarn, Wii series (Sports, Play, Fit, Party, Resort, Motion), Mario Kart Wii, Big Brain Academy, Just Dance series, We Ski / Cheer, Go Vacation, Super Smah Bros. Brawl, Mario & Sonic Olympic series, Rhythm Heaven Fever, Rock Band series, Super Swing Golf.
Can't decide my favourite between Trauma Center, Kirby's Epic Yarn and Go Vacation.
Have great memories playing multiplayer with those games.
Honorable mentions to the MegaDrive (Micro Machines, Streets of Rage), WiiU (NintendoLand, Super Mario 3D World, Mario Kart 8, Game & Wario, Hyrule Warriors) and Switch (Snipperclips, PuyoPuyo Tetris, Rocket League, Flat Heroes, Luigi's Mansion 3, 51 Worldwide Games, Overcooked series, Kingdom Two Crowns).
