Strong Buy
Grading Mimikyu (Lost Origin) currently looks like a clear win. The gap between the $0.86 raw price and the $405.00 PSA 10 price gives a 346% Return on Grading. The upside only holds if the copy grades a 10, so inspect edges and surface first.
Among the 85 cards in Lost Origin with PSA 10 sale data, Mimikyu ranks 2nd for Return on Grading and 4th by PSA 10 price. The median PSA 10 in this set sells for $49.16. 6 of the 85 clear a 100% Return on Grading.