Luigi's Mansion 3DS Poltergust 5000 Upgrades.
As you progress you will occasionally unlock upgrades to the Poltergust 5000
which is the main primary weapon against the ghosts infesting the Evershade Valley.
These upgrades will allow you to perform more powerful attacks:-
#1 Power Gauge Upgrade Collect 2,000 Gold
#2 Dark-Light Upgrade Collect 4,000 Gold
#3 Power Gauge Upgrade Collect 7,000 Gold
#4 Dark-Light Upgrade Collect 10,000 Gold
#5 Super Poltergust Collect 20,000 Gold