Every Trainers' Mail card we price, most valuable first. Prices are what copies actually sold for, updated daily.
What a Trainers' Mail card is worth
The most valuable Trainers' Mail on this list is Trainers' Mail (Secret) from XY - Ancient Origins at $7.01£5.28€6.17, and the 7 priced copies across 4 sets are worth $16£12€15 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.
Trainers' Mail is printed in Japanese as well: 4 cards across 3 sets, the most valuable of them Trainers' Mail (Mirror Holofoil) from The Best of XY at $11.89£8.95€10.47. 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 Trainers' Mail sold for $95.75£72.07€84.32. reverse holo printings are priced separately from the standard card, because they do not trade at the same money. Rarities here include Secret Rare.
If you are trying to identify which Trainers' Mail 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 - Ancient Origins, XY - Roaring Skies, Alternate Art Promos.