Actually the wii is highly capable of Fur Shaders.
Unfortunately I don't think pokemon battle revolution used the wii's TeV units. Maybe if there is another pokemon game on the wii.
Hopefully, they'll try that then. It would be nice to see Milotic with scales or Arcanine with fur....
Don't know about Pikachu, though....
Edit: Nvm, Pikachu can look cartoony like that Queen Bee in Galaxy