All the Equipments are available in game via quest or monster drops or Battlegrounds. Custom equipment are not included.
This are just examples of build, you can take some hints from below and create your own unique build using custom gears available in your server.
Top: +4 Baphomet Horns
Mid: Hockey Mask
Armor: +7 Assassin Robe  + Porcellio Card
Weapon: +9 Glorious Bloody Roar
Shield : -
Garment: +8 Glorious Muffler
Footgear: +7 Glorious Shoes
Accessory 1: Megingjard
Accessory 2: Megingjard
Stats which I use for PvP:
Dex: 70~85 (If you got good hit gears which you can switch to attack high flee opponents then lower your dex or else increase your dex)
With this stats I reach 193 attack speed.
For high flee opponents you should switch gears to dex/hit as high flee characters will have low HP so you can concentrate on your Hit instead of damage.
Mid Headgear: Angel Spirit/Angel Of Ghost
Accessory 1: Cursed hand + Zerom card
Accessory 2: Cursed hand + Zerom card
Infiltrator with Howard Alt-Eisen Card
Specialty Jur  + 4x Howard Alt-Eisen Card
Specialty Jur  2 Howard Alt-Eisen Card & 2 Hydra card
Note: You can also increase your base Dex upto 85 (Should be in multiple of 5x including bonus)
Try to use Dex foods and Box of gloom to decrease your chance of missing attacks
Other Guide for Gx: