Well there is a new pokemon game coming out for the Wii.
It's called PokéPark Wii: Pikachu no Daibouken it was released on December 5, 2009 in Japan.
Translated the game means PokéPark Wii: Pikachu's Adventure. The game is based on the PokéPark which is a traveling theme park in Japan. Many people believe it won't come out in the US because what it's based off of but recently the game was rated in Australia which made people speculate that it will come to the US.
The story is Mew tells Pikachu that there is a crisis and he asks Pikachu for help.
The game is a spin-off game and is mostly mini-games and quizzes. There is a battle system where you actually control Pikachu and use some of Pikachu's moves like Thunderbolt, Quick Attack and Iron Tail.
Here's some gameplay.