Quickest way would be buying and selling CC. Regular way: i have no clue as I haven't tried any alternatives.
If that's the only method that's unfortunate. Any idea what items can be bought and directly sold from IM? Just don't trust gifting.
I would not go only for one dungeon. I agree you can make a lot of money from coc red pass/black from weapons, SRS passes, fragments transformed in Bes, plus HP potions, but GTs and FTs should be exploited too in combination. I would go for VOH and COF in order to craft the critical damage ornaments and const ornaments, than sell it. Also from COF and VOH parts can craft the plates and sell. In Yin, SCM plate for e.g sells the best at high price, because nobody is doing that dungeon. From there you also can sell the inner parts. Then, if you have a pet level 3 send it to search each day. The epic boxes, decos and parts are selling very well. But as a rule, the top items and the rare items are selling at the highest prices. Also, I would follow the events on server and farm the mats, usually mats of events sells very well. Last event, at HW, the mats like lollies and candies were sold for high price. Who was smart enough and knew GC revamp is coming farmed bags of passes from ghosts and now selling the passes for epic prices.
