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Gadget Room!
I found it at the dock
the cap is in the corner
hidden-cant tell
You have to lift up the rock that is underground.
Rookie appears in 2 missions. Missing Coins & Mysterious Tremors.
Right on the wall behind G in the Gadget Room.
easy just go to the cave and do it
the dock i have completed the mission like ten times
Go to the dock and talk to the green penguin after you help him he will ask if there is anything he can do for you when he does ask for the pump.
Go to the link below for more informationP.S: I am not Mimo777
If you are doing the Mysterious Tremors mission, you put it under the gift shop.