This game must be played with the motion plus. But if you OWN this game you should have the motion plus too 
As of right now I don't think Dolphin can emulate the motion plus with in the software. But it does with with a real wiimote with the motion plus attached.
As of right now I don't think Dolphin can emulate the motion plus with in the software. But it does with with a real wiimote with the motion plus attached.