The Grenade is an explosive default weapon available in Star Fox: Assault.
The grenade does not work like other weapons. After being thrown it explodes after a short period of time. When the A or R button is held, the grenade will charge and therefore detonate sooner after throwing. Although the character must be careful for if they hold down the charge to long, they can be harmed by the grenades explosion. The character charging the grenade's throw will make a sound. The height of throwing the Grenade can be changed to accomodate strategy.