Instructions
Press "Right" on the directional pad on the Wii remote to change your weapon to one that can perform the charge shot, such as the Strike Rifle or Warp Pistol.
Press and hold the "B" button on the Wii remote to charge the shot. Each weapon has a different charging animation and takes a few seconds to charge fully.
Release B to fire the shot, after the weapon has fully charged. The weapon is fully charged when the charging animation has finished.