I grew up with the Pokémon anime and I even had the first movie and Mewtwo returns. I loved Pokémon a lot but I had NO IDEA the games existed for so long.
I played a GBA and most games I had for it was boring but it was all I had at the time.
During a book fair I picked up a book on new gen 4 Pokémon, which at the time I thought was for the anime.
It wasn’t until a kid I knew showed me Pokémon Diamond that I realized that a game just like the anime existed. I was like “WHAT?! THAT’S A THING?!” So next Christmas I got Pokémon Diamond.
My first playthrough was me basically doing the DiCaprio pointing meme to every Pokémon I recognized from the anime and my Pokémon books.
After that I would go on the official Pokémon website and learned about all the other Pokémon games and learned Platnium was coming out soon.
I got Platnium and a used copy of Ruby and my Pokémon Journey continued ever since.