Every Xerneas card we price, most valuable first. Prices are what copies actually sold for, updated daily.
What a Xerneas card is worth
The most valuable Xerneas on this list is Xerneas EX (146 Full Art) from XY Base Set at $115.16£86.67€101.42, and the 34 priced copies across 21 sets are worth $454£342€400 together. Most of that sits in a handful of printings: the older the set and the scarcer the print run, the wider the gap to the rest.
Xerneas is printed in Japanese as well: 36 cards across 23 sets, the most valuable of them Xerneas EX from Mythical & Legendary Dream Shine Collection at $246.05£185.19€216.69. Switch the list above to Japanese to read those, or to Both to rank the two catalogues against each other.
The highest PSA 10 on record for Xerneas sold for $3,380£2,544€2,977. reverse holo printings are priced separately from the standard card, because they do not trade at the same money. Rarities here include Illustration Rare, Secret Rare.
If you are trying to identify which Xerneas you have, the set name is printed on the card and the collector number sits in the bottom corner. Open the card here and the page carries every printing of it, the graded prices, and whether grading the copy is worth the fee. Sets to start with: XY Base Set, SM - Forbidden Light, Miscellaneous Cards & Products.