Which Rotom Dex do you have?
Same name, 20× the price: $0.80 to $16 raw. The difference is printed on the card — it is just not somewhere most people think to look.
SM-P Promos · #149
Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them.
$16
53% gem
SM-P Promos · #015
Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them.
$9.99
11% gem
GG End · #053
Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them.
$4.30
80% gem
Sun & Moon · #131
Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them.
$1.19
50% gem
GX Battle Boost · #098
Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them.
$0.80
no PSA data
Sun & Moon Starter Set · #050
Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them.
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no PSA data
We have no hand-checked note for these printings yet, so the guidance above is the general rule rather than something specific to this card.
Prices are raw market value. Click a printing for its full grading verdict — the gem rate, the fees and whether it beats selling raw.