How early did you introduce the games (or show)?
Mine are still years away.
They know the most well known Pokémon thanks to merch and a few old cards that my wife and me had when we were children and conserved.
My oldest watched a few episodes when she was 5, and “read” a Pokémon manga after (she watched the images, she didn’t know how to read). I promised her that I will teach her how to play the cards when she’ll know how to read … I will keep my promise and buy her her own deck for her 7th birthday :-)
I got my kiddo playing around 4 or 5. Mainly just watching. Eventually he started playing games like Coromon, and other monster catchers. The newest Pokémon sadly haven’t run well on his switch either, so I’ve been trying to get him on the older but still favorites like Pearl or Diamond.
