Explanation on New Physical Parleyy:
Do not listen to the ignorant LoL players who think this is a nerf. This is a giant buff. Now this will make Gangplank have some actual skill synergy since now he will be able to be played more like a carry, and also this new parleyy will be affected by armor pen which will make the Brutalizer a key item for Gangplank.
The idea is going with a carry build of Blood Thirster, Inf Edge, Phantom Dancer, Berserker Greaves or Mercury's Treads, a Executioner's Calling and a Brutalizer.
So early game you start out with a Meki Pendant, and 2 Health Pots. You farm till Phil stone and BoS. The next item you will be going for is a Zeal for the PD. Next will be Brutalizer then you shall get a Executioners calling. You will Get a BF Sword, then Finish Phantom Dancer, then finish inf edge then build your Blood Thirster. After that late game I will usually sell my phil stone for blood thirster, and if i get enough money sell my Brutalizer for another Blood thirster. That was a 70 min game where I got that.
The basic 21/0/9 build going for Crit Damage and in utility going for mana regen/movement speed.
I have all Crit Chance and Crit DMG quints. That is not very smart rune build though. You will want Red Armor Pen, Blue Crit Chance and Yellow Crit DMG, with Health/Crit DMG quints.
Go with either, Exhaust and Flash, or Ignite - Flash or Rally - Exhaust. This all depends on your playing style I prefer Exhaust Flash since this is best for late game.
2: Remove Scurvy
4: Raise Morale
6: Cannon Barrage
7-18: Cannon Barrage > Parleyy > Raise Morale > Remove Scurvy
Reason for using Raise Morale is this is going to make your early game hella easy and Remove Scurvy should only be used for a cleanse.
Their is now better synergy between his skills and his normal attack due to the new change of his Physical Parleyy. You will have constant 300-400 dmg regular hit Crits with a 1.67 attack speed and a 700-800 crit parleyy late game. Which is carry potential right there. You will also have a almost 500 movement speed with Raise Morale buff on.