Drum
is a mutated offspring of the evil demon king Piccolo. You must defeat him before you are able to take on Piccolo himself.
Currently all four of the demon offspring have been roaming an nice area called 4 Go London Mori Park. This is a nice park where all members of the family can enjoy.
To find Drum you must fallow a path that goes to some old water storage tanks in the jungle. Due to dense tree cover the coords may be off so pay attention to the hint.
Once you find and beat Drum you can get part of the coords to find Piccolo.