Admiral Bobbery is on his last legs in Paper Mario: The Thousand-Year Door Chapter 5. His final wish is to taste that sweet, sweet (I assume) Chuckola Cola. This starts a quest that can be somewhat confusing.
He’ll tell you that his own stash of the drink probably washed up with the rest of the ship. This should take you back to the crew’s camp and Flavio.
Talk to Flavio, and he’ll admit to having the Chuckola Cola but will refuse to give it up unless you bring him a tropical fruit. You probably wouldn’t be here if you already found this, so let’s proceed with the assumption that you haven’t.
What Flavio is looking for is a coconut.
Where to find a coconut in Paper Mario: The Thousand-Year Door
The tricky part of finding a coconut in Paper Mario: The Thousand-Year Door is that the camera won’t cooperate. To get one, you’ll need to go back to the suspension bridge where you saw the crewmates (including Admiral Bobbery) getting attacked by ghosts.
It doesn’t really show it, but on either side of the bridge, if you walk toward the camera, you’ll drop down onto a platform. You’ll find a couple of gaps over water that are too wide for Mario to cross on his own. You’ll need to partner up with Yoshi and use their flutter jump to cross safely. You’ll make it to a pipe which will spit you out in the background.
You’ll find yourself on another island on the backdrop. There’s a single palm tree there. Walk up and hit it with your hammer. It will drop the two coconuts. Grab them, then head back to Flavio.
Flavio will complain about your gauche choice of fruit (fun fact: coconuts are actually considered a fruit) but will hand over the Chuckola Cola. Take this back to Bobbery, to fulfill his final wish.
Spoiler alert: Bobbery won’t actually die. This is a Mario game. He’ll simply fall asleep. Wake him up, and he’ll join your party.
Here’s an interesting fact: While the drink you fetch is called Chuckola Cola and is a reference to the Mario & Luigi games, it’s actually not intended to be that. In the Japanese version, it’s referred to as “Vintage Red,” which would suggest it’s a wine. This wasn’t changed in the Switch port and still remains as Chuckola Cola.