I just got a GBA e-reader after realizing I have a bunch of Pokémon cards I could scan with one. (They are only around $20 on eBay, from what I've seen.) :
Opened 2002 Nintendo e-Reader Sample Pack with 4 cards Pokemon & Animal Crossing | eBay
Spaceworld 2001: New Look at Pokemon E-Card Reader - IGN
Game Boy Advance e-Reader Sample Pack · Digital Game Museum Collection
e-Reader | Nintendo | Fandom
E Reader SCAN of Pokemon MATCHPRINT Test Color-Proofing Cards - YouTube
The Nintendo e-Reader | Nintendo Facts - YouTube
Amazon.com: Nintendo e-Reader - Card Reader for Game Boy Advance : Video Games
Dusting off the Nintendo e-Reader · Retrospective · An inconvenient way to play subpar games
Pokémon Battle-e | Nintendo | Fandom
Messing around with the old e reader Pokemon cards : r/GameboyAdvance