Adds 2 cannons to the ship and cannon attacks do more damage. MOAB Takedown Ability: harpoons a MOAB class Bloon and brings it down.
~ BTD6 description
Monkey Pirates is the final upgrade of the path 2 for the Monkey Buccaneer in Bloons Tower Defense 5. It costs $3825 on Easy, $4500 on Medium, $4860 on Hard and $5400 on Impoppable. Along with Aircraft Carrier, this upgrade is unlocked at Rank 29 in Bloons TD 5. It adds the MOAB Takedown Ability, which targets the strongest (the closest if there are more bloons of the same strength) bloon on screen (excluding ZOMGs) and brings it down with a grappling hook. You get $300 for destroying a MOAB, $800 for destroying a BFB and $1 for other bloons. Cooldown is 60 seconds.
In Bloons Tower Defense 6, Monkey Pirates returns as the fourth upgrade of Path 2. Along with its Monkey Pirates ability, it shoots a spray of three bombs per shot instead of just one, and all of its Cannon Ship bombs deal +1 damage. The ability can only be used for MOAB-class bloons, and the amount of money gained is exactly the same amount as if the entire blimp was popped manually ($381 for MOABs and DDTs, $1524 for BFBs, refer to the money table for further information on income per-pop penalties). Note that the Alchemist's Rubber to Gold does work on MOAB-class bloons, allowing you to get 3x as much cash if they are affected. There is a cooldown of 50 seconds before using the ability again.
Generally, Monkey Pirates is too much of a jack-of-all-trades tower, dealing decent damage while offering the ability to take down a single MOAB or BFB, which makes it hard to fit into minmaxed strategies.
What makes it worse is that its long ability cooldown means the ability will only be activated only every once in a while.
If it can shoot on both sides, its DPS will be effectively doubled.
Monkey Pirates' MOAB Takedown Ability can actually add to the damage count, unlike BTD5.
In BTD5, the description says that it takes down MOAB-Class Bloons, but can hook normal Bloons instead if no MOAB-Class Bloons are present. While in BTD6, it can only hook MOAB-Class Bloons, similiar to the description.
In Version 17.0, the three-bomb buff now matches the visual artwork of the Monkey Pirates, which always had three rows of cannons per side.
A few hours after Version 17.0 was released, Monkey Pirates became the 69th unique 2MPC tower upgrade listed on the fan-official 2MPC spreadsheet.
On Version 17.0, there was a bug where the outer bombs did not hit camo bloons even with Crow's Nest crosspath.
This was fixed on Version 17.1.
On Version 18.0, the description was changed to mention the extra bombs and extra damage from bombs. Whereas Version 17.0 only modified the description such that they mention the extra amounts of bombs but without mention of extra damage of bombs: "[...] Main attack adds two more cannons."