Wii Remote
Cross = A · Square = B · Triangle = 1 · Circle = 2
Turning the phone moves the pointer, shaking it shakes the Wii Remote, touching the screen centers the pointer.
Nunchuk (a second phone)
Shaking it shakes the Nunchuk · stick = Nunchuk stick
Cross/ZL/ZR = Z · other buttons = C
Classic controller ("Classic" layout, one phone)
Left stick = Nunchuk · right stick = pointer
a = A · b/ZR = B · ZL = Z · L = C · R = shake Nunchuk
Keyboard, mouse and controller keep working at the same time. With a single phone in Wii Remote mode, use the keyboard or a controller for the Nunchuk (WASD, R = shake).