This Article Contains information directly from the Pikmin Games. This article is based off of an Enemy/Treasure/Area/Cave/Pikmin/Character from the Pikmin series of Games.
The Cupid's Grenade is simply a cherry. It is found on Sublevel 4 of the Snagret Hole, and is located in one of the alcoves. Make sure you deal with the Armored Cannon Beetle Larvae and various hazards.