The Pokemon fandom is exceedingly lucky to have such a plethora of merch options, both official and unofficial. Unsurprising, considering it is the highest-grossing media franchise in the world. Far from an Indie game by any means.
Visit any geek shop or media convention and you are almost guaranteed to see something Pokemon related in the artist alley or the commercial booths. As such, it's so easy to find and buy merch, and even finding stuff of your favourite niche is possible. Making an Ita bag (A bag with a clear window at it's front to show off themed pins and small collectables)(Translated to 'Painful bag' as such dedication was/is seen as cringey to some others) is relatively easy. Or a pin board, or just collecting merch because you like it.
I've made a clickable wishlist of merch that I WISH I could get. I hope I will one day, so I can make a pokemon-themed ita bag of my own, or maybe just stuck to my normal, everyday bag. Maybe you'll find something you like too and buy it for yourself ~