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Ok we can't necessarily trade but if we get on at the same time and at say the Grasslands farm and use the geocache on the rare fishes we do have and we have enough players doing this we should be able to pass around the top 4 rare fish and get everyone the trophy quicker.
True it would work on a bit of luck. I think though if you had about a dozen players in a remote place, like the waterfall cave that can only be gotten to by going over a cliff and floating into it, and at the same time could work pretty well. I already have my trophy and except for the gigalev that I can't remember what I did with I have 1 rainbow fish, 2 yins and 2 yangs so I can help out pretty well. It was just a thought I had on a possibility of helping.