(On Rag) Go to the volcano, riding a wyvern, and have a all weight argy on follow. Make sure the argy is on passive. Kill mantis, then harvest them with the wyvern, and load all the poly onto the argy because of the weight reduction. I got thousands of poly in about half an hour using this. If the argy has about 1000-2000 weight you can go for about an hour and come back with thousands of poly.
Dont eat it, tame a decent moschops and level it up, hold E and u can find harvesting levels and put all points on to organic polymer. Tame a couple (male and females) of penguins and make them breed and kill all the babies with the moschops.