Most technically advanced game on Wii?

[F0X]

Eh. The most advanced Wii games use the system's power in different ways, especially ways that benefit the game's direction. Xenoblade's draw distance, Super Mario Galaxy's planetoids, Monster Hunter Tri's animation, Darkside Chronicles with its shadow effects... I wouldn't say that any game pushes the Wii to the limit on all fronts. Only the ones that matter to each game.

Then again, there's always Zangeki no Reginleiv. Too bad it suffered from framerate issues!