There is no real Goldhack for Last Chaos.
There is a way to "Dupe" Items/Gold but for that u need some knowledge about the Game-Structure and then you would need to find some "leak" which can be used to Multiply the Items/Gold, i never played any Episode above EP2 so i cannot tell you if there is a way on newer LC Versions.
But there was a Old-School way on EP2.
Person A - > Drops a Item
Person B -> Picks it Up
Person X -> Crashes the Gameserver.
Result -> Person A & Person B have the Item.
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It dont work on newer Versions on Last Chaos you can try it with public Files and reproduce that bug. (On your own Server.)