It says "Deliver 200 000, 100 000 и 50 000 to each pirate leader". Transport does not help, because they are never found on the coordinates. How then??

You can just find any pirate on teh galaxy map with that icon (the fleets you can destroy) and kill it, but it must b worth 100 points, the killed fleet, which is about 80-90 fighters. So doesnt take that big of a fleet of maybe better ships for you to complete it and claim your +2 agent and a juggernaut afterwards ;)

That's easy. you have to destroy a pirate fleet that has more that 100 points

like juuggernaut, it has 168 pints, but it is hard for you now. Just destroy a big pirate fleet, example

https://xcraft.net/battle/index.php?battle_id=998a01da27a00467db4e5cb15da2e4c9

but better not to mess up with toss fleets they are very strong

You can attack zergs they are easy to destroy, example 

https://xcraft.net/battle/index.php?battle_id=0c4b9f1e21f519394147c1c74c36c683

But in zerg fleet there is a possibility to have scourages in their fleet, which cannot be seen. deals very damage

best is to attack terran pirate fleet. robert, best he has no tech

 https://xcraft.net/battle/index.php?battle_id=ec3d938f05571b2523e759d12b97b6c5

Best fleet is to attack with more than 50 cruisers. very useful 
After battle or send your fleet in mission harvest to collect the goods

good luck

I cant figure out how to complete that quest either.

I am at the point where I have to transport to the pirate leader 2 M metal +1 M mineral + 500 K gas. My problem is that i don't have all those cargos. Can i transfer them in many trips, like 400K each trip? Or it won't count unless transferred in full (2M + 1M + 500K)?

You need to do all in one transport.
And get attacked as thanks :D so you also need to be prepared for that before.
 
Also it is possible to robb it back.
If you do some seconds later.
think about to do it.

jame, so cruisers best choice against pirate ?

Ty stein,

Attacked by the pirate in deep space, or by aliens at home when I get back? What forces to prepare for?

Hmmm, not much insight here:(
Nvm I found out. Here is the scoop:

Reward is 30 destros. A couple of hrs after delivery of shipment to Montana, while transport fleet is still en route, pirate Xyao attacked my planet where i got the reward.
100 cruisers, 10 BS + 1 destro. 4% chance moon forming from debris.
Took me 20 hrs to reach Montana, Xyao took only 3hrs to reach my planet from same coords. Damn fast pirates:(

Seems there are 4 waves of pirate attacks. Each one 24 hrs after the previous and stronger than the last one. Starts with Xyao and 100 cruisers, 10 BS, 1 destro (100k pts). Continues with Lucky, 300 cruisers, 30 BS, 3 destros (300k pts). Next 1 is T-800 with 600 cruisers, 60 BS and 6 destros (850k pts).  Last 1 is Xyao again with 1000 cruisers, 100 BS and 10 destros (1120k pts). All at the same bad time that I should be asleep. Fortunately you can FS and skip them fine for the quest:)
You get 10 more destros 4 your trouble and losses.

This mission should be renamed to "Mission that never ends". Next we need to attack 12:121:2.
2 far 4 my probes to reach
Can smn probe it 4 me?

Nvm, found out how to do it myself, through coord probing on 14/10/17:)

Resources
--------------
1902 metal    
1110 minerals  
318 Vespene    
76 energy  

Defense structures (1)
----------------------------
Rocket launcher 10 000

Fleets (2)
------------
Cruiser 1000
Destroyer 10

Defending fleets (0)
-------------------------
Buildings (7)
----------------
Metal mine 1
Mineral mine 1
Vespene refinery 1
Solar plant 3
Robotics factory 1
Shipyard 1
Research lab 1

Technologies (4)
---------------------
Espionage technology 12
Weapons technology 12
Shielding technology 12
Armour technology 12

waxzyg, 

To complete this mission you have to go to Galaxy section,and look for these red skull symbols.They show you where pirate fleets are on these locations.The mission says you must attack and defeat any pirate fleet that is worth 100 or more stat points. Unfortunately the game dosent do much to show you the value of enemy fleets but you can calculate it by multiplying the amount of ships by their respective points.You can find this out in the catalogue section.

If you highlight the red skull it will show you fleet composition, click on any of the ships shown and it will open a detailed descriptive window for that ship, the points per ship are shown in that window exactly the same as if you were in the ' build ships section '   100 points is not actually a lot of pirate vessels so if you are new go for smaller attacks against weaker vessels type e.g. 3 large cargo, 10 fighters & 8 cruisers = 104 

Romeo_Alfa, 
click on pirate name - it opens global view of player .. click on capital planet - then in galaxy view - search for exact planet .. for example :5 .. then choose Fleet & Transport = that's all, .. :)