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the Common Hippowdon from Prismatic Evolutions is one to leave raw for the moment. Raw copies trade around $5.54 while PSA 10s sell for about $24.50, a -74% Return on Grading. Worth rechecking if the raw price drops or PSA 10 demand spikes.
Among the 105 cards in Prismatic Evolutions with PSA 10 sale data, Hippowdon ranks 100th for Return on Grading and 100th by PSA 10 price. Of the 12 Common cards with PSA 10 sales, it is 11th for Return on Grading. The median PSA 10 in this set sells for $82.73. 14 of the 105 clear a 100% Return on Grading.